rebase from master
added logging in with facebook
temp
added facebook picture integration
added tracking whether the user is a facebook user or not
initial addition of fb
added logging in with facebook
added facebook picture integration
clear stack when application is destroyed
original refactoring
inviting others to games
Merge branch 'social_network_login' of https://github.com/hronik1/my_fitsby_copy into social_network_login

Conflicts:
	res/layout/activity_landing.xml
	src/com/fitsby/LandingActivity.java