ALLJOYN-1876 Expose a mechanism that allows application to provide a
credential used for thin-client authentication to its bundled daemon
in Objective C bindings

This is a new feature which was added to the core code

Change-Id: I4a54faa9256ceae5529375dc710cfc3c68e4b924
ALLJOYN-1839 Add CancelSessionlessMessage method to the Objective C
bindings

Two variants of the cancelSessionlessMessage have been added to the
bindings

Change-Id: Ied7e4006bc9da9dd670a96335c95e7d923ee7edb