PROJ-121: Added datatables for edition
 - Added destroy/update in controller
 - Fixed table header
 - Added Datatables
 - fixed a minor bug in datatables.js where regex was not at the start of the string
PROJ-121: Standardize messages for future error handling
PROJ-121: Added cities
 - Added functions to controller
 - Added partials views
 - Added JS init Datatables
 - Removed Typeahead test
PROJ-121: Added composers
 - Fixed messages in all controllers
 - Added start_date and end_date for edition
 - Migration for rooms timestamp
 - Changed navigation
 - ...