Fix swagger errors

Fixes #287

endpoints/api/tag.py

@@ -66,7 +66,6 @@ class RepositoryTag(RepositoryParamResource):
   """ Resource for managing repository tags. """
   schemas = {
     'MoveTag': {
-      'id': 'MoveTag',
       'type': 'object',
       'description': 'Description of to which image a new or existing tag should point',
       'required': [
@@ -162,7 +161,6 @@ class RevertTag(RepositoryParamResource):
   """ Resource for reverting a repository tag back to a previous image. """
   schemas = {
     'RevertTag': {
-      'id': 'RevertTag',
       'type': 'object',
       'description': 'Reverts a tag to a specific image',
       'required': [