12 days ago, jquery-rails gem was updated to 2.2.0 with jQuery 1.9.0.
This upgrade subsequently broke fulcrum (e.g. bootstrap-twipsy).  As a
temporary fix, the Gem and Gem.lock file has been updated to only
include 2.1.x versions of jquery-rails gem.

jquery-rails gem changelog
===============
2.2.0 (19 January 2012)
* Updated to jQuery 1.9.0
* Updated to latest jquery-ujs

2.1.4 (26 November 2012)
* Updated to jQuery 1.8.3
* Updated to jQuery UI 1.9.2
* Rails 4 compatibility
* Rails 3.1 compatibility (without asset pipeline)
* Rails 3.0 compatibility