First work on JRuby, this commit is broken.
Gemfile tweaks.
Switch Bluepill from Unicorn to Puma.
Fix bugs in Cocaine, ActiveRecord on JRuby.
Remaining fixes needed to get specs passing on JRuby.
Try to remove the extra build on Travis.
Specify Travis builds with exclude rather than include.
Add env: to excludes so they'll match.
Remove rdf-rdfxml gem, write the XML ourselves.

This fixes RDF/XML export support on JRuby.
Unify the Gemfiles.
Clean up the Travis configuration.
Update Cocaine to fix JRuby bug.
Merge pull request #46 from cpence/jruby-migration

Support for JRuby 1.7