Add a new View(friendInfo), beatify the UIs
fix a bug

When you are in the friend list activity and touch a friend bar, it
will crash because of not registering in the AndroidManifest.xml
Great change in DataModel

Add network connecting methods in the DataModel , add a new
View(addFriend) and also adjust some UIs’ effect.
Fix some bug and add a new View(InfoCenter)

Fix the refreshing problem and fix the Character encoding problem
DataModel finished and server has been built

test and fix all known bug
Merge branch 'Test'