Update .travis to use v1.5 for go
Update .travis to use v1.5 for go

timbyr/gophercloud,rackspace/gophercloud,trumant/gophercloud,carolynvs/gophercloud,trumant/gophercloud,rackspace/gophercloud,DSpeichert/gophercloud,jamiehannaford/gophercloud,timbyr/gophercloud,DSpeichert/gophercloud,jamiehannaford/gophercloud,feiskyer/gophercloud,feiskyer/gophercloud,carolynvs/gophercloud