Get rids of the APIEndPoint and APIResource classes. Register API url using the 'has_rest_api' AppConfig variable.

Signed-off-by: Michael Price <loneviking72@gmail.com>

mayan/apps/document_states/apps.py

@@ -18,7 +18,6 @@ from common.permissions_runtime import permission_error_log_view
 from common.widgets import two_state_template
 from mayan.celery import app
 from navigation import SourceColumn
-from rest_api.classes import APIEndPoint
 
 from .classes import DocumentStateHelper, WorkflowAction
 from .handlers import (
@@ -52,6 +51,7 @@ from .widgets import widget_transition_events
 
 class DocumentStatesApp(MayanAppConfig):
     app_url = 'states'
+    has_rest_api = True
     has_tests = True
     name = 'document_states'
     verbose_name = _('Document states')
@@ -59,8 +59,6 @@ class DocumentStatesApp(MayanAppConfig):
     def ready(self):
         super(DocumentStatesApp, self).ready()
 
-        APIEndPoint(app=self, version_string='1')
-
         Action = apps.get_model(
             app_label='actstream', model_name='Action'
         )