Renamed IfFastInjector to IfInjector and nuget-ize integration.

I have renamed my package to IfInjector to reduce confusion with fFastInjector as well as generated / integrated a nuget package to simplify future take-on's.

During the process, I discovered that I was not correctly supporting WP7 which resulted in some fairly significant refactoring of the expression compilation code. I am not seeing any degradation in performance on the features tested, so no hurry on picking up this change from my perspective.