Add DBUS C++ bindings, taken from WengoPhone our friend.

libs/dbus/examples/echo/README

libs/dbus/examples/echo/echo-client.cpp

libs/dbus/examples/echo/echo-client.h

libs/dbus/examples/echo/echo-introspect.xml

libs/dbus/examples/echo/echo-server.cpp

libs/dbus/examples/echo/echo-server.h

libs/dbus/examples/glib/Makefile.am

libs/dbus/examples/glib/dbus-browser.cpp

libs/dbus/examples/glib/dbus-browser.h

libs/dbus/examples/hal/Makefile.am

libs/dbus/examples/hal/hal-listen.cpp

libs/dbus/examples/hal/hal-listen.h

libs/dbus/examples/properties/Makefile.am

libs/dbus/examples/properties/README

libs/dbus/examples/properties/props-introspect.xml

libs/dbus/examples/properties/props-server.cpp

libs/dbus/examples/properties/props-server.h

libs/dbus/include/dbus-c++/api.h

libs/dbus/include/dbus-c++/config.h.in

libs/dbus/include/dbus-c++/connection.h