Tracking publication events for Activities and Sequences.
Better fix to override acts_as_list
Gemfile and ruby version tweaks (Travis)
More Travis config tweaks

See http://about.travis-ci.org/docs/user/languages/ruby/#Dependency-Management
Merge branch 'refs/heads/master' into portal-publications
Working publication logging
This is fundamentally just a join model
Spec test for recording publications
Similar spec test for sequences.