Minor code reorganization.
Added versions of SDL2 and GLEW to vs2013/dep.
For now, we will keep these in a common location to make it easy for applications to develop against them. An install-deps.bat file has been added to vs2013/ to move all required *.dlls into the bin/ directory. This will keep the main repository layout clean of Windows specific dependencies. On *nix-based platforms, we will rely on the user having installed the appropriate dependencies via a package manager.
Test linking to dependency libraries.
Simple graphical app using SDL2+OpenGL.