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Merge branches 'master' and 'master' of https://github.com/easemob/developer.easemob.com

# By jervisliu (6) and others
# Via jervisliu
* 'master' of https://github.com/easemob/developer.easemob.com:
  doc
  doc
  update.
  update.
  update.
  update doc
  update quickstart
  add files
  update android quickstart
  update android doc
  update index.md
  添加好友体系文档
  添加自定义消息类型文档。
  update group
  update doc
  update doc
  IOSDemo->iOSDemo
  update

# By jervisliu (6) and others
# Via jervisliu
* 'master' of https://github.com/easemob/developer.easemob.com:
  doc
  doc
  update.
  update.
  update.
  update doc
  update quickstart
  add files
  update android quickstart
  update android doc
  update index.md
  添加好友体系文档
  添加自定义消息类型文档。
  update group
  update doc
  update doc
  IOSDemo->iOSDemo
  update