Order versions by build date
Order versions by build date

Closes #321.

square/rubygems.org,rubygems/rubygems.org-backup,bpm/getbpm.org,dstrctrng/private_event,square/rubygems.org,1337807/rubygems.org,square/rubygems.org,rubygems/rubygems.org-backup,rubygems/rubygems.org-backup,1337807/rubygems.org,bpm/getbpm.org,1337807/rubygems.org,dstrctrng/private_event