Basic Endless Scrolling

Added in a dirty version of Endless Scrolling. It's a little jittery right now, but is a great start. Works whether you are filtering by all Jawns, or just Sparks/Ideas.

Sam, I created a few new API handlers: "AddXJawns", "AddXSparks", and "AddXIdeas". Instead of creating a fresh JawnAdapter they simply append Jawns on to the end of the existing one. I think it can be cleaned up though, because I stripped it from your old GetXJawns files.