Reverted jCanvas update
Improved step() and added built in webworker

Put conditional statements for translation statements and added use of
Blob() for collision webworker to remove the need for the workers
directory.
Removed workers/
Removed debugging statements
Added unminified worker code back to repo

For the sake of future work on the threaded code, the workers will still
be kept in workers/ in the repo, but for production will be minified and
embedded into heights.js
Removed .prototype from draw constant declarations
Merge pull request #13 from twisterghost/master

Update to version 1.1.0