Added SimpleDI code as a stopgap for pcl MEF (lack)

Instead of adding a new DI framework that I hope will work in the
future, I am implementing some simple DI code that will get me where I
need to be in the near future. Still will need to do some recomposition
code also, and maybe some attributes and reflection, but this should
suffice for now (I'm not using porpGib stuff right now anyway).