* Upgraded Visual Studio project files to VS2012.
 * Fixed issue where window caption wasn't actually set when passed to the GLWindow constructor on Windows.
 * Fixed issue where WM_DESTROY event wasn't handled properly and could lead to an endless loop or crash.
 * Fixed the issue where EVENT_EXPOSE was never raised in response to a WM_PAINT message (see Remarks at http://msdn.microsoft.com/en-us/library/windows/desktop/dd145213%28v=vs.85%29.aspx for details on WM_PAINT).
 * Restore files to original versions before pull request.
Merge pull request #2 from charleskorn/master

GLWindow fixes for Windows