Refactored Method Name of Interface 

In my attempt to familiarize myself with ReactiveCocoa I refactored the method names to best of my understanding. I figured this would be the only chance I'd have to improve the accessibility of the code as a new comer with the fresh perspective that will hopefully be diminished as I become more familiar with the project.

I refactored the methods so that methods that return void begin with verbs and methods that return objects begin with the type of object they return.

I realize that changing the interface is a big change and the benefits not as evident for those familiar with it. Even if you don't accept any of my changes I hope that you'll consider my intentions.