Add hint to the user that starting swagger may take a while.

A throbber won't do, since swagger is synchroneous and the browser won't animate it.

js/server/assets/swagger/swagger-ui.js

@@ -1483,7 +1483,7 @@ SwaggerClient.prototype.build = function (mock) {
 
   var self = this;
 
-  this.progress('fetching resource list: ' + this.url);
+  this.progress('fetching resource list: ' + this.url + '; Please wait.');
 
   var obj = {
     useJQuery: this.useJQuery,
@@ -32184,4 +32184,4 @@ SwaggerUi.Views.StatusCodeView = Backbone.View.extend({
     }
     return this;
   }
-});}).call(this);
+});}).call(this);