Updated math_ext Transform.

- Added operator*(const Transform&).
- Added access to translation.
Added class MeshManager.
Added Model class.

A model is a composition of meshes.
Updated model test to test model class.

Current test will create a model from the previous quad test mesh and move it back and forth starting from left to right.
Note: I couldn't get boost date_time library to link so movement is frame-time dependent.
Added std replacement for boost dependencies.
Added C++11 workaround flags for VS.
Added small test for sys.
Commited a bunch of stuff to get build working on VS2012.