nameservice: add name directory

bin/Makefile.am

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

bin/dbus/dbusclient.cpp

bin/dbus/dbusconfigurationmanager.cpp

bin/dbus/dbusconfigurationmanager.h

configure.ac

src/Makefile.am

src/client/configurationmanager.cpp

src/client/ring_signal.cpp

src/dring/account_const.h

src/dring/call_const.h

src/dring/configurationmanager_interface.h

src/ringdht/Makefile.am

src/ringdht/namedirectory.cpp

src/ringdht/namedirectory.h

src/ringdht/ringaccount.cpp

src/ringdht/ringaccount.h