Updated FontCommon to support WP8

Serializer is not supported in WP8, therefore FontCommon was changed to
use the DataContract serializer
Merge from craftworkgames after restructuring
Update to start working with the fork

* update to the path to the core project in the solution file because
the old one was still referenced
* updated .gitignore to exclude all suo files + all thumbs.db files
Added missing System.Runtime.Serialization include to GUI project
Merge pull request #2 from brainchest/master

Infrastructure changes to start working with the projects