Addition of new build configuration NET45WP8
It adds some custom msbuild things to the structuremap.csproj. This configuration currently only builds the main assembly.This commit already contains numerous extension methods to make the reflection API
look like the .NET 4 pendant.
Necessary changes to make use of the "buffer" layer to be able to have the code look much like the .NET 4 code.
Merge pull request #174 from flq/pcl_parte_deux

Pcl (part II) - Targetting of Pcl profile for .NET 4.5 + WP8 + Windows Store Apps