Fixes a hang due to deadlock when called on the main thread
Actually call the method to clear the cache (if necessary)
Rename the key to make it's purpose a bit clearer
Move the -reloadData method to the main implementation and make it public
Override & implement the cache clearing method
Fixes a bug where 'nextPage:' wouldn't always load more
Use super's reload data method
nextPage: no longer returns a BOOL, correct the delegate interface