Typeahead 0.9.2 upgrade

Upgrade typeahead.js and typeahead.min.js to v0.9.2.
Remove CSS files because they're no longer necessary according to [the changelog](https://github.com/twitter/typeahead.js/blob/master/CHANGELOG.md#090-march-24-2013)
Update the README to reflect these changes.

Feedback welcome, of course :)