Stop testing with iojs
Stop testing with iojs

Travis seems to have stopped supporting iojs (now that node 4.2 is out), so
this patch is dropping it from .travis.yml.

inverno/restbase,inverno/restbase,d00rman/restbase,milimetric/restbase,gwicke/restbase,wikimedia/hyperswitch,eevans/restbase,Pchelolo/restbase,wikimedia/mediawiki-services-restbase,Pchelolo/restbase,wikimedia/restbase,cscott/restbase,milimetric/restbase,gwicke/restbase,wikimedia/restbase,d00rman/restbase,eevans/restbase,wikimedia/mediawiki-services-restbase,cscott/restbase