qnd: added external media plugin

git-svn-id: svn+ssh://kelev.kaltura.com/usr/local/kalsource/backend/server/tags/falcon_2012_08_20@94039 6b8eccd3-e8c5-4e7d-8186-e12b5326b719
qnd: external media plugin - permissions script

git-svn-id: svn+ssh://kelev.kaltura.com/usr/local/kalsource/backend/server/tags/falcon_2012_08_20@94040 6b8eccd3-e8c5-4e7d-8186-e12b5326b719
adding empty directories