soofani-THContactPicker 是对 THContackPicker 的扩展，实现了联系人的多选支持，并对 UI 进行改进。
Details:
Control now loads contacts from address book after requesting permission.
Added model class THContact
Used custom cell view for easier UI customization.
Added neat circular checkbox to the left side of the contact cell.
Added circular contact images.
Text filter field and table view resize using animation for smoother feel.
Bar button on the top right is disabled by default and enabled when there is at least 1 contact selected.
Keyboard is dismissed when tapping outside the filter text field.
