When possible, use jQuery .on() rather than .live().

jQuery v1.9.0 no longer has .live() in the API.  Instead use .on() if
it is available.

Testing the fix:
- installed jquery-rails v1.0.15 which has jQuery v1.6.2

  pre-v1.7 jQuery uses .live() and has NO .on()

  works

- installed jquery-rails v1.0.19 which has jQuery v1.7.1

  has both .live() and .on()

  works

- installed jquery-rails v2.2.0 which has jQuery v1.9.0

  has .on() and NO .live()

  works