add i18n deps to hammer-cli rpm spec and adjust epel 6 comps accordingly

After the i18n merge hammer-cli requires fast_gettext and locale. These are both available in Fedora 19 and locale is available Fedora for EL6, however fast_gettext needs to be added to the el6 repo, so the comps file has been updated accordingly. 

I went ahead and built fast_gettext as well.
http://koji.katello.org/koji/buildinfo?buildID=8668