(/=) Database

(/=) DatabaseManager, such that we can change the version (onUpgrade,
onDowngrade)
(+) Definitions which stores most of the definitions
(/=) Friends, Post accordingly
(+) PostsInterface, interface to Posts to not put the definitions of
the methods in the same place of the implementation
Merge branch 'master' of https://github.com/glukas/Social

Conflicts:
	Social/src/ch/ethz/inf/vs/android/glukas/project4/MainActivity.java