Replaced 'id' property in FBGraphUser.h and FBGraphPlace.h with 'userID' and 'placeID' respectively. This solves false positive warnings about usage of private APIs during App Store submission, which may lead to rejection

Conflicts:
	samples/HelloFacebookSample/HelloFacebookSample/HFViewController.m
	samples/SwitchUserSample/SwitchUserSample/SUUserManager.m
	samples/SwitchUserSample/SwitchUserSample/SUUsingViewController.m