Add Famo.us Implementation

Finally it has arrived, a PropertyCross implementation using the [Famo.us](http://famo.us) framework.

I have included screenshots of this for iOS 7, Windows Phone 8 and Android: https://github.com/matthewdunsdon/PropertyCross-Site/commit/b3e36174

Closes #274
The vendor folder,which was removed in b6953328ffd6a, was a solution that I assembled myself to get around a problem with our existing PhoneGap Build scripts.

The PhoneGap Build scripts have been fixed for Famo.us and are discussed in README.md as of aafe52117647db.