@orta => Mainscreen contents

![screen shot 2014-10-01 at 8 08 04 pm](https://cloud.githubusercontent.com/assets/498212/4480280/e933a262-4995-11e4-918f-a2f0de05b3e6.png)

Still left to do:

- [x] get all the TODOs todid.
- [x] snapshot test for listings VC
- [x] grab number of bids
- [ ] test with stubbed images
probably valuable on a global scope, eventually worth moving into a `RACSignal+Extensions.swift`