EtherpadLite class : added listAllPads() (tested)
See http://etherpad.org/doc/v1.2.9/#index_listallpads
Etherpad API 1 -> 1.2.1
Bug for listAllPads: json data seems to be {"padIDs", [...]} instead of [...]
Console: first method listAllPads implemented
Correction: test for listAllPads()
Merge branch 'list-pads' into develop