Break out callbacks in auth controller

h/static/scripts/auth.coffee

@@ -8,22 +8,11 @@ class AuthController
   constructor:   ( $scope,   $timeout,   session ) ->
     timeout = null
 
-    this.submit = (form) ->
-      return unless form.$valid
-
-      data = {}
-      method = '$' + form.$name
-
-      for own key of session
-        delete session[key]
-
-      angular.extend session, $scope.model
-
-      session[method](
-        (session) ->
+    success = ->
       $scope.model = null
       $scope.$broadcast 'success'
-      , (response) ->
+
+    failure = (form, response) ->
       {errors, reason} = response.data
 
       if reason
@@ -40,7 +29,18 @@ class AuthController
         form[field].responseErrorMessage = error
 
       $scope.$broadcast 'error', form.$name
-      )
+
+    this.submit = (form) ->
+      return unless form.$valid
+
+      data = {}
+      method = '$' + form.$name
+
+      for own key of session
+        delete session[key]
+
+      angular.extend session, $scope.model
+      session[method] success, angular.bind(this, failure, form)
 
     $scope.$on '$destroy', ->
       if timeout