Added call to super method of scrollViewDidScroll

Added call to super method of scrollViewDidScroll since in the superClass's method it check if this is end of scrollview 

self.isAtEnd = (aScrollView.contentOffset.x >= IFTTTMaxContentOffsetXForScrollView(aScrollView));
Merge pull request #27 from bluesm/patch-2

Added call to super method of scrollViewDidScroll