Fix some bugs that prevented the MBContactPicker from working out of the box, it was creating a ContactCollectionView that was always 0 points tall because [self updateCollectionViewHeightConstraints] was no longer getting invoked.
Moved UICollectionViewDataSource implementation into the ContactCollectionView.  Some things still need to be cleaned up, added as warnings
Re-implement reset of entry cell after contact is selected
Add warning for UITextField delegate method that probably needs to be moved
Indentation