Updated google play services to rev 7

I think I found the reason why setting up my dev environment following your instructions didn't compile on my machine. I had installed the google play services rev 7 via the sdk-manager while in your repository was a lover version. This difference seemed to led to the compiling errors when importing all three projects. (Wich version is installed on your pc?)

Now I replaced the play services library, set up a new dev environment following your instructions, and it works :)

Please try if this works on your machine too.