Remove deprecation warnings
Allow the config file to not specify any groups.
Rake task fixes

- Allow empty target translation - Auto create translation output directory
Use last line of bundle show output when environment outputs spurious text.
Merge pull request #26 from bdwong/rake_task_fixes

Rake task fixes
Work with Ruby 2
Add release notes, bump version
Update release notes
Merge pull request #27 from Sage/ruby2wo

Fix spec to work with Ruby 2.0.0