First set of changes to make StructureMap a pcl

This set of commits targets the profile .NETFramework4 + Windows 8 Store Apps.

* my rake call creates a .bundle folder - I put that into .gitignore
* The csproj file of StructureMap was completely exchanged - if something was hidden in there, it may cause problems
* Some interesting assemblyscanner methods have moved to their own assembly. Say, in a Nuget, that would should be included for targetting .NET4 purely.
* I am running VS2013 - if some incompatibility to VS2012 sneaked in, we need to check that.

All major changes are noted in the commit messages, have a look through them.
The test suite ran ok, I left one failing test in `Xml.Testing`, namely that `StructureMapException` is serializable. It is **not**. If you are OK with this just delete it and merge the little bugger!