diff --git a/.agignore b/.agignore
new file mode 100644
index 00000000..849ddff3
--- /dev/null
+++ b/.agignore
@@ -0,0 +1 @@
+dist/
diff --git a/docs/customization/plugin-api.md b/docs/customization/plugin-api.md
index db88ca71..245b5a14 100644
--- a/docs/customization/plugin-api.md
+++ b/docs/customization/plugin-api.md
@@ -293,7 +293,7 @@ const MyWrapSelectorsPlugin = function(system) {
 
 Wrap Components allow you to override a component registered within the system.
 
-Wrap Components are function factories with the signature `(OriginalComponent, system) => props => ReactElement`.
+Wrap Components are function factories with the signature `(OriginalComponent, system) => props => ReactElement`. If you'd prefer to provide a React component class, `(OriginalComponent, system) => ReactClass` works as well.
 
 ```javascript
 const MyWrapBuiltinComponentPlugin = function(system) {
@@ -310,9 +310,12 @@ const MyWrapBuiltinComponentPlugin = function(system) {
 }
 ```
 
-```javascript
-// Overriding a component from a plugin
+Here's another example that includes a code sample of a component that will be wrapped:
 
+```javascript
+/////  Overriding a component from a plugin
+
+// Here's our normal, unmodified component.
 const MyNumberDisplayPlugin = function(system) {
   return {
     components: {
@@ -321,6 +324,7 @@ const MyNumberDisplayPlugin = function(system) {
   }
 }
 
+// Here's a component wrapper defined as a function.
 const MyWrapComponentPlugin = function(system) {
   return {
     wrapComponents: {
@@ -328,6 +332,7 @@ const MyWrapComponentPlugin = function(system) {
         if(props.number > 10) {
           return <div>
             <h3>Warning! Big number ahead.</h3>
+            <OriginalComponent {...props} />
           </div>
         } else {
           return <Original {...props} />
@@ -336,8 +341,30 @@ const MyWrapComponentPlugin = function(system) {
     }
   }
 }
+
+// Alternatively, here's the same component wrapper defined as a class.
+const MyWrapComponentPlugin = function(system) {
+  return {
+    wrapComponents: {
+      NumberDisplay: (Original, system) => class WrappedNumberDisplay extends React.component {
+        render() {
+          if(props.number > 10) {
+            return <div>
+              <h3>Warning! Big number ahead.</h3>
+              <OriginalComponent {...props} />
+            </div>
+          } else {
+            return <Original {...props} />
+          }
+        }
+      }
+    }
+  }
+}
 ```
 
+
+
 ##### fn
 
 The fn interface allows you to add helper functions to the system for use elsewhere.
diff --git a/docs/usage/installation.md b/docs/usage/installation.md
index 63f7d233..e4fd09d2 100644
--- a/docs/usage/installation.md
+++ b/docs/usage/installation.md
@@ -49,7 +49,7 @@ const ui = SwaggerUIBundle({
     presets: [
       SwaggerUIBundle.presets.apis,
       SwaggerUIBundle.SwaggerUIStandalonePreset
-    ]
+    ],
     layout: "StandaloneLayout"
   })
 ```
@@ -86,7 +86,7 @@ This will serve Swagger UI at `/swagger` instead of `/`.
 You can embed Swagger-UI's code directly in your HTML by using unkpg's interface:
 
 ```html
-<script src="//unpkg.com/swagger-ui-dist@3/swagger-ui-bundle.js">
+<script src="//unpkg.com/swagger-ui-dist@3/swagger-ui-bundle.js"></script>
 <!-- `SwaggerUIBundle` is now available on the page -->
 ```
 
diff --git a/src/core/components/deep-link.jsx b/src/core/components/deep-link.jsx
new file mode 100644
index 00000000..44aa08bb
--- /dev/null
+++ b/src/core/components/deep-link.jsx
@@ -0,0 +1,20 @@
+import React from "react"
+import PropTypes from "prop-types"
+
+export const DeepLink = ({ enabled, path, text }) => {
+    return (
+        <a className="nostyle"
+          onClick={enabled ? (e) => e.preventDefault() : null}
+          href={enabled ? `#/${path}` : null}>
+          <span>{text}</span>
+        </a>
+    )
+}
+DeepLink.propTypes = {
+  enabled: PropTypes.bool,
+  isShown: PropTypes.bool,
+  path: PropTypes.string,
+  text: PropTypes.string
+}
+
+export default DeepLink
diff --git a/src/core/components/operation.jsx b/src/core/components/operation.jsx
index 37ec4d16..7063cf22 100644
--- a/src/core/components/operation.jsx
+++ b/src/core/components/operation.jsx
@@ -102,12 +102,13 @@ export default class Operation extends PureComponent {
     const Schemes = getComponent( "schemes" )
     const OperationServers = getComponent( "OperationServers" )
     const OperationExt = getComponent( "OperationExt" )
+    const DeepLink = getComponent( "DeepLink" )
 
     const { showExtensions } = getConfigs()
 
     // Merge in Live Response
     if(responses && response && response.size > 0) {
-      let notDocumented = !responses.get(String(response.get("status")))
+      let notDocumented = !responses.get(String(response.get("status"))) && !responses.get("default")
       response = response.set("notDocumented", notDocumented)
     }
 
@@ -120,12 +121,11 @@ export default class Operation extends PureComponent {
               and pulled in with getComponent */}
               <span className="opblock-summary-method">{method.toUpperCase()}</span>
               <span className={ deprecated ? "opblock-summary-path__deprecated" : "opblock-summary-path" } >
-              <a
-                className="nostyle"
-                onClick={isDeepLinkingEnabled ? (e) => e.preventDefault() : null}
-                href={isDeepLinkingEnabled ? `#/${isShownKey.join("/")}` : null}>
-                <span>{path}</span>
-              </a>
+              <DeepLink
+                  enabled={isDeepLinkingEnabled}
+                  isShown={isShown}
+                  path={`${isShownKey.join("/")}`}
+                  text={path} />
                 <JumpToPath path={specPath} /> {/*TODO: use wrapComponents here, swagger-ui doesn't care about jumpToPath */}
               </span>
 
diff --git a/src/core/components/operations.jsx b/src/core/components/operations.jsx
index 46a04cc9..6500587e 100644
--- a/src/core/components/operations.jsx
+++ b/src/core/components/operations.jsx
@@ -37,6 +37,7 @@ export default class Operations extends React.Component {
     const OperationContainer = getComponent("OperationContainer", true)
     const Collapse = getComponent("Collapse")
     const Markdown = getComponent("Markdown")
+    const DeepLink = getComponent("DeepLink")
 
     let {
       docExpansion,
@@ -79,12 +80,11 @@ export default class Operations extends React.Component {
                     onClick={() => layoutActions.show(isShownKey, !showTag)}
                     className={!tagDescription ? "opblock-tag no-desc" : "opblock-tag" }
                     id={isShownKey.join("-")}>
-                    <a
-                      className="nostyle"
-                      onClick={isDeepLinkingEnabled ? (e) => e.preventDefault() : null}
-                      href= {isDeepLinkingEnabled ? `#/${tag}` : null}>
-                      <span>{tag}</span>
-                    </a>
+                    <DeepLink
+                        enabled={isDeepLinkingEnabled}
+                        isShown={showTag}
+                        path={tag}
+                        text={tag} />
                     { !tagDescription ? null :
                         <small>
                           <Markdown source={tagDescription} />
diff --git a/src/core/components/param-body.jsx b/src/core/components/param-body.jsx
index 980ef490..13a4377f 100644
--- a/src/core/components/param-body.jsx
+++ b/src/core/components/param-body.jsx
@@ -47,7 +47,7 @@ export default class ParamBody extends PureComponent {
 
   updateValues = (props) => {
     let { specSelectors, pathMethod, param, isExecute, consumesValue="" } = props
-    let parameter = specSelectors ? specSelectors.getParameter(pathMethod, param.get("name"), param.get("in")) : {}
+    let parameter = specSelectors ? specSelectors.getParameter(pathMethod, param.get("name"), param.get("in")) : fromJS({})
     let isXml = /xml/i.test(consumesValue)
     let isJson = /json/i.test(consumesValue)
     let paramValue = isXml ? parameter.get("value_xml") : parameter.get("value")
diff --git a/src/core/components/response-body.jsx b/src/core/components/response-body.jsx
index 1e48f4e5..e239c258 100644
--- a/src/core/components/response-body.jsx
+++ b/src/core/components/response-body.jsx
@@ -43,7 +43,11 @@ export default class ResponseBody extends React.Component {
 
       // Image
     } else if (/^image\//i.test(contentType)) {
-      bodyEl = <img style={{ maxWidth: "100%" }} src={ window.URL.createObjectURL(content) } />
+      if(contentType.includes("svg")) {
+        bodyEl = <div> { content } </div>
+      } else {
+        bodyEl = <img style={{ maxWidth: "100%" }} src={ window.URL.createObjectURL(content) } />
+      }
 
       // Audio
     } else if (/^audio\//i.test(contentType)) {
diff --git a/src/core/oauth2-authorize.js b/src/core/oauth2-authorize.js
index c5521aaf..0de353d2 100644
--- a/src/core/oauth2-authorize.js
+++ b/src/core/oauth2-authorize.js
@@ -46,7 +46,7 @@ export default function authorize ( { auth, authActions, errActions, configs, au
       authId: name,
       source: "validation",
       level: "error",
-      message: "oauth2RedirectUri configuration is not passed. Oauth2 authorization cannot be performed."
+      message: "oauth2RedirectUrl configuration is not passed. Oauth2 authorization cannot be performed."
     })
     return
   }
diff --git a/src/core/plugins/ast/ast.js b/src/core/plugins/ast/ast.js
index d067e80f..880cdb38 100644
--- a/src/core/plugins/ast/ast.js
+++ b/src/core/plugins/ast/ast.js
@@ -103,30 +103,30 @@ export function positionRangeForPath(yaml, path) {
 
   let ast = cachedCompose(yaml)
 
-  // simply walks the tree using current path recursively to the point that
+  // simply walks the tree using astValue path recursively to the point that
   // path is empty.
   return find(ast)
 
-  function find(current) {
-    if (current.tag === MAP_TAG) {
-      for (i = 0; i < current.value.length; i++) {
-        var pair = current.value[i]
+  function find(astValue, astKeyValue) {
+    if (astValue.tag === MAP_TAG) {
+      for (i = 0; i < astValue.value.length; i++) {
+        var pair = astValue.value[i]
         var key = pair[0]
         var value = pair[1]
 
         if (key.value === path[0]) {
           path.shift()
-          return find(value)
+          return find(value, key)
         }
       }
     }
 
-    if (current.tag === SEQ_TAG) {
-      var item = current.value[path[0]]
+    if (astValue.tag === SEQ_TAG) {
+      var item = astValue.value[path[0]]
 
       if (item && item.tag) {
         path.shift()
-        return find(item)
+        return find(item, astKeyValue)
       }
     }
 
@@ -135,17 +135,35 @@ export function positionRangeForPath(yaml, path) {
       return invalidRange
     }
 
-    return {
-      /* jshint camelcase: false */
+    const range = {
       start: {
-        line: current.start_mark.line,
-        column: current.start_mark.column
+        line: astValue.start_mark.line,
+        column: astValue.start_mark.column,
+        pointer: astValue.start_mark.pointer,
       },
       end: {
-        line: current.end_mark.line,
-        column: current.end_mark.column
+        line: astValue.end_mark.line,
+        column: astValue.end_mark.column,
+        pointer: astValue.end_mark.pointer,
       }
     }
+
+    if(astKeyValue) {
+      // eslint-disable-next-line camelcase
+      range.key_start = {
+        line: astKeyValue.start_mark.line,
+        column: astKeyValue.start_mark.column,
+        pointer: astKeyValue.start_mark.pointer,
+      }
+      // eslint-disable-next-line camelcase
+      range.key_end = {
+        line: astKeyValue.end_mark.line,
+        column: astKeyValue.end_mark.column,
+        pointer: astKeyValue.end_mark.pointer,
+      }
+    }
+
+    return range
   }
 }
 
diff --git a/src/core/plugins/spec/actions.js b/src/core/plugins/spec/actions.js
index b332f953..6ec1ed9c 100644
--- a/src/core/plugins/spec/actions.js
+++ b/src/core/plugins/spec/actions.js
@@ -1,6 +1,7 @@
 import YAML from "js-yaml"
 import parseUrl from "url-parse"
 import serializeError from "serialize-error"
+import isString from "lodash/isString"
 import { isJSONObject } from "core/utils"
 
 // Actions conform to FSA (flux-standard-actions)
@@ -22,22 +23,16 @@ export const UPDATE_OPERATION_VALUE = "spec_update_operation_value"
 export const UPDATE_RESOLVED = "spec_update_resolved"
 export const SET_SCHEME = "set_scheme"
 
-export function updateSpec(spec) {
-  if(spec instanceof Error) {
-    return {type: UPDATE_SPEC, error: true, payload: spec}
-  }
+const toStr = (str) => isString(str) ? str : ""
 
+export function updateSpec(spec) {
+  const cleanSpec = (toStr(spec)).replace(/\t/g, "  ")
   if(typeof spec === "string") {
     return {
       type: UPDATE_SPEC,
-      payload: spec.replace(/\t/g, "  ") || ""
+      payload: cleanSpec
     }
   }
-
-  return {
-    type: UPDATE_SPEC,
-    payload: ""
-  }
 }
 
 export function updateResolved(spec) {
@@ -52,9 +47,6 @@ export function updateUrl(url) {
 }
 
 export function updateJsonSpec(json) {
-  if(!json || typeof json !== "object") {
-    throw new Error("updateJson must only accept a simple JSON object")
-  }
   return {type: UPDATE_JSON, payload: json}
 }
 
@@ -76,7 +68,10 @@ export const parseToJson = (str) => ({specActions, specSelectors, errActions}) =
       line: e.mark && e.mark.line ? e.mark.line + 1 : undefined
     })
   }
-  return specActions.updateJsonSpec(json)
+  if(json) {
+    return specActions.updateJsonSpec(json)
+  }
+  return {}
 }
 
 export const resolveSpec = (json, url) => ({specActions, specSelectors, errActions, fn: { fetch, resolve, AST }, getConfigs}) => {
@@ -130,18 +125,6 @@ export const resolveSpec = (json, url) => ({specActions, specSelectors, errActio
     })
 }
 
-export const formatIntoYaml = () => ({specActions, specSelectors}) => {
-  let { specStr } = specSelectors
-  let { updateSpec } = specActions
-
-  try {
-    let yaml = YAML.safeDump(YAML.safeLoad(specStr()), {indent: 2})
-    updateSpec(yaml)
-  } catch(e) {
-    updateSpec(e)
-  }
-}
-
 export function changeParam( path, paramName, paramIn, value, isXml ){
   return {
     type: UPDATE_PARAM,
diff --git a/src/core/plugins/spec/selectors.js b/src/core/plugins/spec/selectors.js
index 71914c7d..ba35abc2 100644
--- a/src/core/plugins/spec/selectors.js
+++ b/src/core/plugins/spec/selectors.js
@@ -256,10 +256,11 @@ export const allowTryItOutFor = () => {
 
 // Get the parameter value by parameter name
 export function getParameter(state, pathMethod, name, inType) {
+  pathMethod = pathMethod || []
   let params = spec(state).getIn(["paths", ...pathMethod, "parameters"], fromJS([]))
-  return params.filter( (p) => {
+  return params.find( (p) => {
     return Map.isMap(p) && p.get("name") === name && p.get("in") === inType
-  }).first()
+  }) || Map() // Always return a map
 }
 
 export const hasHost = createSelector(
@@ -272,6 +273,7 @@ export const hasHost = createSelector(
 
 // Get the parameter values, that the user filled out
 export function parameterValues(state, pathMethod, isXml) {
+  pathMethod = pathMethod || []
   let params = spec(state).getIn(["paths", ...pathMethod, "parameters"], fromJS([]))
   return params.reduce( (hash, p) => {
     let value = isXml && p.get("in") === "body" ? p.get("value_xml") : p.get("value")
@@ -295,6 +297,7 @@ export function parametersIncludeType(parameters, typeValue="") {
 
 // Get the consumes/produces value that the user selected
 export function contentTypeValues(state, pathMethod) {
+  pathMethod = pathMethod || []
   let op = spec(state).getIn(["paths", ...pathMethod], fromJS({}))
   const parameters = op.get("parameters") || new List()
 
@@ -313,6 +316,7 @@ export function contentTypeValues(state, pathMethod) {
 
 // Get the consumes/produces by path
 export function operationConsumes(state, pathMethod) {
+  pathMethod = pathMethod || []
   return spec(state).getIn(["paths", ...pathMethod, "consumes"], fromJS({}))
 }
 
@@ -329,6 +333,7 @@ export const canExecuteScheme = ( state, path, method ) => {
 }
 
 export const validateBeforeExecute = ( state, pathMethod ) => {
+  pathMethod = pathMethod || []
   let params = spec(state).getIn(["paths", ...pathMethod, "parameters"], fromJS([]))
   let isValid = true
 
diff --git a/src/core/presets/base.js b/src/core/presets/base.js
index 133df134..1521fa28 100644
--- a/src/core/presets/base.js
+++ b/src/core/presets/base.js
@@ -61,6 +61,7 @@ import PrimitiveModel from "core/components/primitive-model"
 import Property from "core/components/property"
 import TryItOutButton from "core/components/try-it-out-button"
 import VersionStamp from "core/components/version-stamp"
+import DeepLink from "core/components/deep-link"
 
 import Markdown from "core/components/providers/markdown"
 
@@ -121,7 +122,8 @@ export default function() {
       OperationExt,
       OperationExtRow,
       ParameterExt,
-      OperationContainer
+      OperationContainer,
+      DeepLink
     }
   }
 
diff --git a/test/components/operations.js b/test/components/operations.js
index 8a6a7506..bfcbed4f 100644
--- a/test/components/operations.js
+++ b/test/components/operations.js
@@ -3,11 +3,13 @@ import React from "react"
 import expect, { createSpy } from "expect"
 import { render } from "enzyme"
 import { fromJS } from "immutable"
+import DeepLink from "components/deep-link"
 import Operations from "components/operations"
 import {Collapse} from "components/layout-utils"
 
 const components = {
   Collapse,
+  DeepLink,
   OperationContainer: ({ path, method }) => <span className="mocked-op" id={`${path}-${method}`} />
 }