Rounded corners in body > div. Handle narrow width. Disable buttons during auto-step.  Fix README link.  Add compiled js to .gitignore.
Add Firefox compatibility.
Toggle CodeMirror readonly support.  Combine setup.coffee with metajs.coffee.
Remove coffee-script-iced.large.js
Load CodeMirror as early as possible.  Disable run during auto-step (which causes an error).
Merge pull request #7 from omphalos/browser-fixes

Miscellaneous fixes
Stop trying to make Map a polyfill.

ES6's map does provide items(), but it returns an iterator. It only really makes
sense to use it if we have `for-of` loops, so there's little point in trying to
fill in that behavior at the moment.
Misc tweaks to index.html.
Style edits.
Add in Google Analytics.
Update README.