messages: add isComposing indicator

bin/dbus/cx.ring.Ring.ConfigurationManager.xml

bin/dbus/dbusclient.cpp

bin/dbus/dbusconfigurationmanager.cpp

bin/dbus/dbusconfigurationmanager.h

bin/jni/configurationmanager.i

bin/jni/jni_interface.i

configure.ac

src/account.cpp

src/account.h

src/client/configurationmanager.cpp

src/client/ring_signal.cpp

src/dring/configurationmanager_interface.h

src/im/instant_messaging.cpp

src/jamidht/jamiaccount.cpp

src/jamidht/jamiaccount.h

src/sip/sipaccountbase.cpp

src/sip/sipaccountbase.h