CSHARP-934: reorganizing repository. Moved all source files into src folder and all build related files into build folder.

moved GlobalAssemblyInfo.cs and TestEnvironment.cs into shared folder.
CSHARP-934: adjusting build script to accomodate new repository structure.
CSHARP-616: removed strong naming and removed the keys.
 upgraded projects to VS2013
CSHARP-625: changed projects to target .NET 4.5. Will add in compilation constants for 4.5 specific features to allow us to target 4.0 during builds.