Fix issue with custom template http request

Update to use the response.data which is the actual template vs the entire response when passing to processNotificationTemplate.

Author: Marcosdg3

src/angular-ui-notification.js

@@ -63,7 +63,9 @@ angular.module('ui-notification').provider('Notification', function() {
                 // load it via $http only if it isn't default template and template isn't exist in template cache
                 // cache:true means cache it for later access.
                 $http.get(args.template,{cache: true})
-                  .then(processNotificationTemplate)
+                  .then(function(response){
+                    processNotificationTemplate(response.data);
+                  })
                   .catch(function(data){
                     throw new Error('Template ('+args.template+') could not be loaded. ' + data);
                   });