maip/ticketlist-1 — pull request #4 by sichunai (2014-11-08 20:31:00+00:00)
Title: added validation for no negative tickets

![screen shot 2014-11-08 at 12 53 58 pm](https://cloud.githubusercontent.com/assets/7917324/4965481/24d3feda-6786-11e4-92cf-feb61201376a.png)