move the json app state to /app/state no cache

Not every browser supports "Vary: Accept" so it's not a good idea
to try to serve the HTML of the app on the same path as the JSON
endpoint used for syncing the dynamic application state.

h/js/controllers.coffee

@@ -169,7 +169,7 @@ class App
     $scope.$on '$reset', => angular.extend $scope, @scope
 
     # Fetch the initial model from the server
-    $http.get '',
+    $http.get 'state',
       withCredentials: true
     .success (data) =>
       if data.model? then angular.extend $scope, data.model