Cleanup

Some cleanups.

- Removed executable bits
- Changed module names to under_scores
- Renamed `blockID` module to `blocks`. I think `from blocks import WOOD` is the most natural way to import a wooden block. An alternative would be `block_ids`. What do you think?
- PEP8 cleanup
I'm all for giving credit, but not in a chaotic, unstructured way. What about an AUTHORS file?

> My initial thought is that from blocks import WOOD would lead to from blocks import * which is bad practice and to be discouraged.
No, the "good" way would be to `from minecraft import blocks` and then `blocks.WOOD`.