Show form-wide auth failures inline

This is a step better than flash messages. It could be reworked to
inline above the submit button, or elsewhere, easily by changing the
template.

h/js/controllers.coffee

@@ -624,12 +624,14 @@ class Auth
       code: null
 
     _reset = ->
+      delete $scope.errors
       angular.extend $scope.model, base
       for own _, ctrl of $scope when typeof ctrl?.$setPristine is 'function'
         ctrl.$setPristine()
 
-    _error = (form, errors={}) ->
-      $scope.errors = {}
+    _error = (form, data) ->
+      {errors, reason} = data
+      $scope.errors = session: reason
       $scope.errors[form] = {}
       for field, error of errors
         $scope.errors[form][field] = error

h/js/session.coffee

@@ -89,8 +89,7 @@ class SessionProvider
 
         # Return the response or a rejected response.
         if data.status is 'failure'
-          flash 'error', data.reason
-          $q.reject(data.errors)
+          $q.reject(data)
         else
           model