Removed call to dead jsonData function.

This is my first pull request - been banging my head on a backbone tutorial - so forgive me if I'm doing this wrong.

From what I can tell, findAll has a vestigial call to a jsonData function which was removed in favor of the serializer parameter. Since the data variable in findAll was declared twice, I was receiving "object has no method jsonData" errors when calling collection.fetch on a stored collection.