written buckets pages
Port "direct push" for  Android

Commiting the updated document that reflect the pushmessage helper api.
fixed page id
Merge pull request #11 from naoki-akimoto/write_bucket

written buckets pages
Port managing group page for REST API.
Port creating a group page for REST API.
Port changing a group name page for REST API.
Port changing a group owner page for REST API.
port listing groups page for REST API.
Port listing group member page for REST API.
Port adding group members page for REST API.