un-retire rubygem-factory_girl

Hi, rubygem-factory_girl was retired during march since it was orphaned for some while. I did not picked it up at that time, since nothing was using it. Now I discovered that it would be handy to have it in Fedora to be able to execute test suite of rubygem-cucumber-rails. Hence I inted to un-retire it. Here is the re-review request: https://bugzilla.redhat.com/show_bug.cgi?id=1470580 Thx Vít