recurly/recurly-js — pull request #92 by chrissrogers (2013-11-02 00:14:54+00:00)
Title: Adds a few additional behaviors to add-ons in the subscribe ui

1. setting add-on quantity to zero will remove the add-on
2. setting add-on quantity to a negative value will not calculate a negative total, instead calculating zero contribution to the total
3. removing an add-on with a quantity less than one, then re-adding that add-on will reset its quantity to 1

Signed-off-by: Christopher Rogers