ALLJOYN-1683 Add MsgArg structs to the unity bindings

The MsgArg.set can now handle signatures of structs.  The members of the
struct must be passed in as an object array.

Added basic smoke test for MsgArg of structs.  Still need to test container
combinations.

Added documentation for a few methods that were not documented.

Change-Id: Ice3aa376c8875807e10a2a04ab3edb016e4b6945
ALLJOYN-1940 Updated unit test since the Build Info string has been modified

Change-Id: I097dd208f114b9adaeb536a3bbed4ef158120f58
Removed print statements that were inadvertently committed

Change-Id: I16479f6e2c8ee25b02888373fa491378b296e483
ALLJOYN-1672 Add the ability to handle Arrays of structs

Change-Id: Ie21e9a6de989cd1d11913606690ad44e94e49126