Rails 2 and Rails 3 CI builds will be run in separate jobs, so switch gemset based on job name.
Rails 2 and Rails 3 CI builds will be run in separate jobs, so switch gemset based on job name.

I'd really like to have been able to parameterize the gemset on the
branch, because that's what's actually changing; unfortunately, that
information doesn't appear to be available from Hudson.
(cherry picked from commit 8dc4382e67782523f4a64bbfc0e23db54d72c932)

NUBIC/aker-rails,NUBIC/aker-rails