Added Krush Blokk match 3 game example

Please review and let me know what I screwed up and where! :)

Should only work with `loom use latest --firehose` for now due to the recently merged `OffsetTiledImage` functionality.
I might not have intended this to be added in the top-level gitignore, but it's for ignoring minified css files (which I think Loom automatically generates for LML styles?).