Fixed bug 2232 - Version Mismatch in VS2013 Solution File
Joe LeVeque
Line 3 of SDL_VS2013.sln file reads "# Visual Studio 2012" instead of "# Visual Studio 2013" which causes Windows to associate the file with Visual Studio 2012, if installed, instead of Visual Studio 2013.
Added project files for Visual Studio 2013
Added /arch:SSE code generation option to prevent SSE2 floating point functions from being implicitly called (which aren't linked in SDL)