frontend: Add version column to templates main tab

http://www.ovirt.org/index.php?title=Features/Template_Versions

Bug-Url: https://bugzilla.redhat.com/show_bug.cgi?id=1037478
Change-Id: Iae04ceb5e75ba541f49bbae87e499ee91aacf718
Signed-off-by: Arik Hadas <ahadas@redhat.com>