Add Realtime APIs: getUserChannel, cometUserChannel.
Added Friends and fans APIs (/APP/FriendsFans): 
getFriendsByOffset, getFansByOffset, getFollowingByOffset, 
becomeFriend, removeAsFriend, becomeFan, setFollowing, getCompletion.
Merge pull request #3 from askeing/master

Added Friends&Fans and Realtime APIs.