travis: Add Go 1.5 test
travis: Add Go 1.5 test

Signed-off-by: Stéphane Graber <089afc6d81f66f1168a9849e15660feae286e024@ubuntu.com>

beni55/lxd,akshaykarle/lxd,techtonik/lxd,Skarlso/lxd,lxc/lxd,techtonik/lxd,chrisglass/lxd,Malizor/lxd,jumpstarter-io/lxd,atxwebs/lxd,ericsnowcurrently/lxd,mjeanson/lxd,Skarlso/lxd,jsavikko/lxd,yura-pakhuchiy/lxd,erikmack/lxd,techtonik/lxd,atxwebs/lxd,stgraber/lxd,jumpstarter-io/lxd,lxc/lxd,Malizor/lxd,lxc/lxd,pcdummy/lxd,hallyn/lxd,jumpstarter-io/lxd,mikemccracken/lxd,ollie314/lxd,hallyn/lxd,mjeanson/lxd,lxc/lxd,dustinkirkland/lxd,lxc/lxd,mikemccracken/lxd,dustinkirkland/lxd,yura-pakhuchiy/lxd,erikmack/lxd,jsavikko/lxd,stgraber/lxd,stgraber/lxd,pcdummy/lxd,hallyn/lxd,ericsnowcurrently/lxd,smoser/lxd,stgraber/lxd,atxwebs/lxd,dustinkirkland/lxd,beni55/lxd,achanda/lxd,ericsnowcurrently/lxd,lxc/lxd,atxwebs/lxd,ollie314/lxd,georghopp/lxd,stgraber/lxd,hallyn/lxd,hallyn/lxd,mikemccracken/lxd,erikmack/lxd,jsavikko/lxd,smoser/lxd,lxc/lxd,chrisglass/lxd,akshaykarle/lxd,hallyn/lxd,ollie314/lxd,Malizor/lxd,Skarlso/lxd,pcdummy/lxd,stgraber/lxd,stgraber/lxd,smoser/lxd,georghopp/lxd,achanda/lxd,yura-pakhuchiy/lxd,achanda/lxd,mjeanson/lxd,beni55/lxd,chrisglass/lxd,georghopp/lxd,Skarlso/lxd,akshaykarle/lxd