Update jquery-rails gem

As of jquery-rails 3.0.0, jquery-ui is no longer included. It's
available through the jquery-ui-rails gem. There is still a custom
build of jquery-ui in the codebase which could be replaced by
appropriate requires from jquery-ui-rails.

The version bump takes us to jQuery 1.10, which no longer has the
.live() method so the remaining uses of it have been replaced with calls
to .on().
Update cucumber-rails gem