* bus/activation.c:
	- Added service file reloading.
	  Each service files directory is kept in an hash table in
	  BusActivation and each BusActivationEntry knows what .service-file it
	  was read from. So when you try to activate a service the bus will
	  check if it's been updated, removed or if new .service-files has
	  been installed.
	- Test code at the bottom for the service file reloading.
	* bus/test-main.c: (main):
	* bus/test.h:
	- added service reloading test.
	* dbus/dbus-sysdeps.c:
	* dbus/dbus-sysdeps.h: (_dbus_delete_directory): Added.