Remove Node 4 travis tests
Remove Node 4 travis tests

camptocamp/ngeo,adube/ngeo,camptocamp/ngeo,Jenselme/ngeo,adube/ngeo,Jenselme/ngeo,camptocamp/ngeo,Jenselme/ngeo,camptocamp/ngeo,camptocamp/ngeo,adube/ngeo,Jenselme/ngeo,adube/ngeo