Add Linux/Unix support via scripts.

Hello, I was looking around at some NES development material and ran across your project. I find the concept interesting, but as I'm a Linux user, I've added some scripts and made some modifications to your existing batch setup to get these to compile and assemble under Linux (in my case, Fedora 20/bash/WINE). I've tested across both platforms to make sure the ROMs are still playable. This merge request is available if you would like to incorporate these items.