@ashfurrow => Switch to CocoaPods for Test Deps, adds a Button class

![selfie-1](http://i.imgur.com/aYHA3Ry.gif)

* I've moved the `submodules/FBSnapshotTestCase` dep out into CocoaPods, so we can use others if we're interested too. Should make the Bots build.

* Added a Button class. It's not particularly functional functional, but I don't want to deal with more submodules  for RAC on a monday morning. Bunch of XCode config jiggering around some issues from synx last week. 

* Tests are not built redundantly on every app run. 
* Moved back to iOS 8 as the target.


Not sure yet, think this `to()` format is ugly. Prefer Expecta's `to().x()`. Right now my initial feel is to have the spaces. Don't feel too strongly though.

Meeting with @modocache tonight, will whine at him about it. Probably a hard constraint from swift.