Added VS 2013 templates. Uses correct version of the Microsoft.VisualStudio.SmartDevice.ProjectSystem.Base assembly

Currently VS 2013 templates are built from \ProjectTemplates\VisualStudio2012\ folder. 
But I found that \WindowsPhone\__Game.vstemplate file has a reference to the old version of the *Microsoft.VisualStudio.SmartDevice.ProjectSystem.Base* assembly:
    <Assembly>Microsoft.VisualStudio.SmartDevice.ProjectSystem.Base, Version=11.0.0.0, Culture=Neutral, PublicKeyToken=b03f5f7f11d50a3a</Assembly>

Due to this it was impossible to create Windows Phone project in VS 2013.
I've changed this version to v12.0.0.0 and updated build files. 
Now it works correctly.

Best regards,
Ilia