Propagate form errors to caller and flash for auth

Relates to #1200

h/js/controllers.coffee

@@ -701,24 +701,35 @@ class Auth
     code: null
 
   this.$inject = [
-    '$scope', 'authentication',
+    '$scope', 'authentication', 'flash'
   ]
   constructor: (
-     $scope,   authentication
+     $scope,   authentication,   flash
   ) ->
     _reset = =>
       angular.copy @scope, $scope.model
       for own _, ctrl of $scope when typeof ctrl?.$setPristine is 'function'
         ctrl.$setPristine()
 
+    _success = ->
+      _reset()
+      $scope.$emit 'success', form.$name
+
+    _error = (response) ->
+      if response.errors
+        # TODO: show these messages inline with the form
+        for field, error of response.errors
+          console.log(field, error)
+          flash('error', error)
+      if response.reason
+        flash('error', reason)
+
     $scope.$on '$reset', _reset
 
     $scope.submit = (form) ->
       angular.extend authentication, $scope.model
       return unless form.$valid
-      authentication["$#{form.$name}"] ->
-        _reset()
-        $scope.$emit 'success', form.$name
+      authentication["$#{form.$name}"] _success, _error
 
 
 class Editor

h/js/flash.coffee

@@ -55,7 +55,7 @@ flashInterceptor = ['$q', 'flash', ($q, flash) ->
 
       if data.status is 'failure'
         flash 'error', data.reason
-        $q.reject(data.reason)
+        $q.reject(data)
       else if data.status is 'okay' and data.model
         response.data = data.model
         response