Added helpshift prompt for repeated login failures

As most of our bad reviews come from users unable to login, it seemed like adding a button to allow quick access to Helpshift was worthwhile. Here's a screenshot:

![contact us](https://cloud.githubusercontent.com/assets/437043/3491454/18c0974e-0592-11e4-832e-79936f0d5a27.png)

So perhaps append it to the bottom of the error message? I.e. 

"Error Message Here"
"If you are continue to have trouble logging in, tap the contact us button on the bottom of the screen to be connected to our support teams"?