added like and dislike funcionality
Merge branch 'master' of github.com:NatPadHack/MtpHackathon2013 into likes

Conflicts:
	hackatonServer/app/models/Drop.java
Merge branch 'master' of github.com:NatPadHack/MtpHackathon2013 into likes
Merge pull request #4 from NatPadHack/likes

Likes