ASABASE-343 - segmentation fault when trying to run Timer

1) Ensured that values with signature 'b' (aka booleans) are
   unmarshalled into 4 bytes long variables.

2) Removed unnecessary calls to AJ_CloseMsg(). There is a catch-all
   call in the application message loop.

Change-Id: If1f68d43b9518258cf0a16bda9bb9a66fce890a0
Signed-off-by: Eyal Ilsar <eyali@qce.qualcomm.com>