Added bootstrap 3.0-wip compiled assets

From https://github.com/twitter/bootstrap/tree/3.0.0-wip
I ran `make bootstrap` then copied the contents of
bootstrap/js -> app/assets/javascript/bootstrap
bootstrap/img -> app/assets/images/bootstrap
bootstrap/css -> app/assets/css/bootstrap
required bootstrap and added overrides

- Added a bootstrap_overrides file for css
- Required in applications.css
- Deleted the bootstrap minified files as they wont be needed