[Property] Support of DLNA.ORG_CI, DLNA.ORG_FLAGS and DLNA.ORG_OP

Fix https://github.com/01org/dleyna-server/issues/54

Add 3 new properties to Resource.
As for other Resources properties, they are also directly
available in MediaTiem2 or MediaContainer2 item by using the
algorithm for selecting resource, given in the section
"Transcoding and org.gnome.UPnP.MediaItem2".

Signed-off-by: Ludovic Ferrandis <ludovic.ferrandis@intel.com>