Bump jQuery version to ~1.9.0

Per this release note:

http://blog.getbootstrap.com/2013/02/07/bootstrap-2-3-released/

Bootstrap 2.3 should be including jQuery 1.9.

I feel we should alter the `2.3.2` release tag to include this change as well as master. This breaks bower installs unless you pass `--force-latest` if another dependency is using 1.9