XBMC Add-on and Repository builder.

This is a clean slate. Everything works.
Simply execute "./build" and push the created zips back to github.

Executing "./build" will do the following 3 things:
1) It will create the xbmc repository under a folder called "repo"
2) It will create 3 zip files under the folder "downloads"
3) It will update the "downloads/README.md" download links to the latest version

Once you have run "./build", commit and push the created zips and repo back to github.
From there on out, you simply need to run "./build" when you wish to update your addon.