Citrrus/MBContactPicker — pull request #51 by brunchboy (2014-01-15 17:21:35+00:00)
Title: Make MBContactPickerModelProtocol properties read-only.

The properties defined in the `MBContactPickerModelProtocol` were defined as read-write, but the picker implementation only needs to read them. Marking them explicitly read-only saves implementors having to
either provide setters (which may simply discard the attempt to change the value), or ignore the Xcode warnings about the setters not being auto-generated.