Add in extra user gem cap to sabrecat gems

@SabreCat I figured out the negative gem count issue in #4328, it's because the boost to the gem count  for subscribing for more than 3 months wasn't taken into account. This should do it.

I was worried that a brand new account, one that hadn't subscribed, would throw an error, but it looks like the `ng-if='user.purchased.plan.planId''` took care of that.

![screen shot 2014-12-04 at 5 49 44 pm](https://cloud.githubusercontent.com/assets/2916945/5308568/f368bc20-7bdd-11e4-8672-e3dd4d863d91.png)