ALLJOYN-1948: Fix crash on OpenWrt.

Change-Id: Ideef5001b08b352c26a5d9fcf3cc7f465ed1e455
ALLJOYN-1949: Fixed bug in SessionlessObj::CancelMessage that caused failure to remove signal if another local endpoint sent one with same serial number

Change-Id: I96ab2c39e97d9a86c4c7f2ce2366d0fdc20654c9
ALLJOYN-1575 Fix crash in LocalEndpoint::AlarmTriggered due to deleted ReplyContext

Change-Id: I9414181a52cd541e1dbcbb4d2008b127d8b1271f
ALLJOYN-1950 NullEndpoint::PushMessage must convert error codes other than ER_STOPPING_THREAD into ER_OK
to resemble the behavior of RemoteEndpoint.
If RegisterReplyHandler fails, ProxyBusObject::MethodCall does not need to unregister the reply handler.

Change-Id: Ic0924e2d812e747d7f9b8b4539ca0fe895e930e9
ALLJOYN-1847: Added sessionless signal catchup feature for AJ clients using the same daemon

Change-Id: I65a1b93e74080d637de6ea568a649f18130bbc60