Bumping travis node_js to 4.0 and 5.0
Bumping travis node_js to 4.0 and 5.0

linkeddata/ldnode,evWork/nds-server,dmitrizagidulin/solid-server-unstable,nicola/ldnode,evWork/nds-server,evWork/nds-server,dmitrizagidulin/solid-server-unstable,linkeddata/ldnode,nicola/ldnode,dmitrizagidulin/solid-server-unstable