Fix breakages mentioned in Issue 12 and ensure pullToRefreshViewShouldRe...

[zman0900]

...fresh is called when beginLoading is called.

Issue #12 mentions a few problems that gmckenzi found fixes for a few months ago. Since he never made a pull request and I am using this code right now, I went ahead and made it myself.

I also found that pullToRefreshViewShouldRefresh was not getting called in the delegate after calling beginLoading like I expected, so I moved the call into setState: so it is always called.