Add VS2012 and VS2010 projects and update tool versioning.

Compilation for VS2012 and VS2010 will currently fail due to the use of C++11 features. This change set anticipates that @HughPowell will merge modifications to source files that remove the C++11 features.

This also updates VS2010 and VS2012 project files with tools version set to 4.0. This will prevent a warning upon compile when the 12.0 tools are not installed. All tools versioning is removed from imported .props files as this is not required and the files are intended to span platform versions.