Enable token authentication for the API, add API token request view

mayan/apps/rest_api/__init__.py

@@ -0,0 +1,10 @@
+from __future__ import absolute_import
+
+from django.utils.translation import ugettext_lazy as _
+
+from .classes import APIEndPoint
+from .urls import api_urls
+
+endpoint = APIEndPoint('rest_api')
+endpoint.register_urls(api_urls)
+endpoint.add_endpoint('auth_token_obtain', _(u'Obtain an API authentication token.'))