Update coffee-rails dependency to version 3.1.1
Update coffee-rails dependency to version 3.1.1

flores/travis-ci,openeducation/travis-ci,fxposter/travis-ci,flores/travis-ci,flores/travis-ci,openeducation/travis-ci,fxposter/travis-ci,openeducation/travis-ci,fxposter/travis-ci