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 think some helper functions that traverse the tree would definitely be helpful. Possibly XPath even, but that's probably asking a lot.

Would be nice to have something that returns the value if found, otherwise returns default value provided (I think getAttribute already does that, but you still have to get to the element with checks first).

A lot of those helper functions are somewhat domain-specific though (like for color, angle, texture, etc.), so it might not make a lot of sense to add them as core helper functions.

As for parseInt, I'm not sure if I thought about that when writing it, maybe it would be better to rename it to avoid confusion?