Adding delete functionality and clearing bad token.

This isn't quite ready to be merged yet.

I have a question on https://github.com/snowpool/ios_native_app/blob/signing_out_bad_user/Snowpool/Controllers/SPLCarpoolViewController.m#L42-45 

Where I'm performing the delete and in the success popping back to the old dashboard.  I need to perform a refresh on the controller... What's the best way to do that?  Seems like I need to "tell" the controller I'm popping to do a refresh... but seems like you'd do that in a segue.. which is exactly what I'm trying to avoid.

Or do I need to implement a delegate?!