added validator for v2

src/main/coffeescript/view/MainView.coffee

@@ -14,13 +14,15 @@ class MainView extends Backbone.View
         if (sorterName == "alpha") # sort top level paths if alpha 
           @model.apisArray.sort sorter
 
-    log @model
     if @model.info and @model.info.license and typeof @model.info.license is 'string'
       name = @model.info.license
       url = @model.info.licenseUrl
       @model.info.license = {}
       @model.info.license.name = name
       @model.info.license.url = url
+
+    if @model.url.indexOf('http://localhost') is -1 and @model.swaggerVersion is 2
+      @model.validatorUrl = @model.url
  
   render: ->
     # Render the outer container for resources

src/main/template/main.handlebars

@@ -17,6 +17,11 @@
     <h4 style="color: #999">[ <span style="font-variant: small-caps">base url</span>: {{basePath}}
     {{#if apiVersion}}
     , <span style="font-variant: small-caps">api version</span>: {{apiVersion}}
-    {{/if}}]</h4>
+    {{/if}}]
+    {{#if validatorUrl}}
+    <span style="float:right"><a href="http://online.swagger.io/validator/debug?url={{url}}"><img id="foo" src="http://online.swagger.io/validator?url={{url}}"></a>
+    </span>
+    {{/if}}
+    </h4>
     </div>
 </div>