renamed discoveryUrl to url to match js change

src/main/coffeescript/SwaggerUi.coffee

@@ -34,14 +34,14 @@ class SwaggerUi extends Backbone.Router
 
   # Event handler for when url/key is received from user
   updateSwaggerUi: (data) ->
-    @options.discoveryUrl = data.discoveryUrl
+    @options.url = data.url
     @load()
 
   # Create an api and render
   load: ->
     # Initialize the API object
     @mainView?.clear()
-    @headerView.update(@options.discoveryUrl)
+    @headerView.update(@options.url)
     @api = new SwaggerApi(@options)
 
   # This is bound to success handler for SwaggerApi