Ensure that we are using a consistent view of cellHeight across MBContactPicker and ContactCollectionView, provide a minimum of cellHeight when calculating the currentContactHeight
Ensure that we are using a consistent view of cellHeight across MBContactPicker and ContactCollectionView, provide a minimum of cellHeight when calculating the currentContactHeight

octanner/MBContactPicker,Citrrus/MBContactPicker,xuzhiming/MBContactPicker