stub classes

MarathonBoard stub and BlockBag
Merge remote-tracking branch 'origin/master'

Conflicts:
	BlockStack/BlockStack/BlockStack.csproj

	BlockStack/BlockStackContent/obj/x86/Debug/BlockStackContent.contentproj.FileListAbsolute.txt
	BlockStack/BlockStackContent/obj/x86/Debug/ContentPipeline.xml

	BlockStack/BlockStackContent/obj/x86/Debug/DesignTimeResolveAssemblyReferencesInput.cache
	OpenGame/obj/Debug/DesignTimeResolveAssemblyReferencesInput.cache