Implemented Pull to Refresh

Pull to Refresh implemented. Still buggy but works. 

A problem I've noticed is that when more than the original amount of Jawns has been loaded (through the Endless Scroll), it takes a LONG time to refresh the Jawns (~3-5 minutes), but does eventually work. I'm not sure if this is a problem on my end or on the Database side. We should explore in depth when we're in the same room.