Converts calls to .live() to .on() on .die() to .off()

.live() and .die() were deprecated in jQuery 1.7, and removed in jQuery
1.9.

See: http://api.jquery.com/category/deprecated/deprecated-1.7/ and
http://api.jquery.com/category/removed/
Merge pull request #79 from mscottford/topic/spree-1-2-stable/jquery-updates

Converts calls to `.live()` to `.on()` and `.die() to `.off()`