Created a build process, added build files, added a nice Makefile.

The only important files here are ``Makefile`` and ``.gitignore``. Everything else is just binaries / love files to build the game. 

``make`` will build the game for all platforms (linux, mac, win x64, win x86) and archive them so you have nice ``.zip`` files to share. You can archive or build for a specific platform: ``make archive-linux`` or ``make build-win-x64`` for example.