Update wrapper API to www.oschina.net, friends-list added.

New API for getting all friends including my-fans, and users who have focused on me.

Also update Android sample osc-tweet to show the friends-list.

Now rename the java-library of osc-server to osc4j. However the java-lib is still under sample project for future more features.

Checkout friends-list API here.

More info.