use kvo to update avatar.
added following and followers view controller
Merge branch 'master' of https://github.com/adamdahan/StyleSnaps2 into fnish_side_profile

Conflicts:
	StyleSnaps.xcodeproj/project.pbxproj
	StyleSnaps/SideProfileViewController.m
wrong corner radius
Merge pull request #11 from adamdahan/following_follower_avatar_pick

Following follower avatar pick