Upgrade bootstrap to 2.3.2

My motivation for this issue is to allow Recline to be used in CKAN without being iframed. 

The problem is that Bootstrap 2.0.2 requires an older JQuery version (1.7.x). As CKAN uses a newer version, we have to run Recline inside an iframe to sandbox it.

With this change, Recline should work fine with a newer version of JQuery (which we can upgrade in another pull request).