Move to NuGet

This basically does the heavy lifting. All one would have to do now is to, as you said: "clone and build".

One caveat where I would need your help is the Bootstapper stuff that uses some Validatation of ObjectFactory. This is a breaking change to the most recent structuremap version. I've otherwise tried to convert the calls to structuremaps registries to their actual equivalents. 

I've only touched a few source code files, the rest is project or dependency stuff.