Unity3D - Cache files, solution settings files and meta file update

Hi! 

I've added the most annoying files that are coming from Mac and Windows: .DS_STORE file and the .db file extension.

Unity3D: http://unity3d.com/
UnityVS former contributer: http://syntaxtree.com/
UnityVS current contributer: http://unityvs.com/ (also syntax tree but ms branded)

Also added three files that occur in Unity3D projects: .tmp, .sln.DotSettings and the .pidb.meta all coming from the IDE VS2013.


Regards
Matthias