[manual] Backend support for Android GCM push notifications

This adds a dependency on gcmclient:
http://gcm-client.readthedocs.org/en/latest/gcmclient.html

pip install gcm-client

or

apt-get install python-gcm-client

(imported from commit 9f1fbf1f793e4a27baed85c6f1aa7a7b03106a10)

zproject/urls.py

@@ -217,6 +217,9 @@ v1_api_and_json_patterns = patterns('zerver.views',
     url(r'^users/me/apns_device_token$', 'rest_dispatch',
         {'POST'  : 'add_apns_device_token',
          'DELETE': 'remove_apns_device_token'}),
+    url(r'^users/me/android_gcm_reg_id$', 'rest_dispatch',
+        {'POST': 'add_android_reg_id',
+         'DELETE': 'remove_android_reg_id'}),
     url(r'^users/(?P<email>.*)/reactivate$', 'rest_dispatch',
             {'POST': 'reactivate_user_backend'}),
     url(r'^users/(?P<email>.*)$', 'rest_dispatch',