Remove embedded third-party libraries

Removed Twitter Bootstrap and jQuery from the bundle
They are now automatically included via composer

This requires the inclusion of AsseticBundle, LessPHP, and CSSEmbed.

Update to Twitter Bootstrap v2.2.2 and jQuery 1.8.3

Update the README file with
- additional instructions for Assetic
- composer installation instructions

Closes #11
Merge pull request #24 from shaneog/remove-bootstrap-files

Remove embedded third-party libraries