Merge pull request #4 from JoschaMetze/master

Different import csharp target for android builds
Add support for inferring DLLs from lib/ without target framework.

Also added comments for NuGet package detection.
Update README.md
Merge branch 'pr/2'

Conflicts:
	Protobuild.exe
	ProtobuildManager/bin/Debug/ProtobuildManager.exe