(Etherpad 1.4.0) Etherpad 1.4.0 compatibility
(Etherpad 1.4.0) Update .travis.yml to etherpad 1.4.0
Merge pull request #981 from mrvisser/etherpad-1.4.0

(Etherpad 1.4.0) Etherpad 1.4.0 compatibility