Merge pull request #14 from lbt05/master

增加美国站点的证书文档
Add a notice for location service.
Merge pull request #15 from ufosky/master

Add a notice for location service.
added document for unread message count
Fixed android guide
Update realtime.md
Improved status_system.md
Improved status guide.
Merge remote-tracking branch 'upstream/master'
Merge remote-tracking branch 'upstream/master'
Merge pull request #16 from ufosky/master

Update iOS guide documents.
Fixed status title
Fixed sms template
Fixed status guide title
Improved rest api.
Improved rest api.
Added cql to push_guide
realtime
added description for super peer
Merge branch 'master' of github.com:avoscloud/avoscloud-doc