Fix ordering of adding long press gesture recognizer

[jhersh]

I'm seeing repeatable crashes upon dealloc in the UILongPressGestureRecognizer associated with LXReorderableCollectionViewFlowLayout.

I believe this stems from the order in which LXReorderableCollectionViewFlowLayout sets up its gesture recognizers on the collection view in setupCollectionView.

Specifically, my collection view does not have a default long press gesture recognizer, so when setupCollectionView calls -requireGestureRecognizerToFail to attach it to the default long press recognizer, it actually ends up requiring itself to fail and thusly (I'd guess) prevents itself from being deallocated.

The fix is simple: don't add the new long press gesture recognizer to the collection view until after any other -requireGestureRecognizerToFail dependencies are set up.

[DaGaMs]

indeed, I got the same crashes when popping the collectionview from the view hierarchy. I fixed it in my branch but won't send a pull request as you've already done so ;-)

[lxcid]

Thanks for the fix guys. This should have been merge in much earlier. Sorry for the delay!