add go 1.4 to travis.ci version matrix
add go 1.4 to travis.ci version matrix

crunchywelch/confd,glerchundi/confd,elbidigital/confd,Lineberty/confd,glerchundi/renderizr,nevermosby/confd,cvrabie/confd,israelchen/confd,zytek/confd,aledbf/confd,glerchundi/renderizr,PrFalken/confd,Fitbit/confd,Flipkart/confd,blippar/confd,cvrabie/confd,crunchywelch/confd,kelseyhightower/confd,aledbf/confd,Flipkart/confd,linearregression/confd,elbidigital/confd,crandles/confd,Ropes/confd,monder/confd,shencan/confd,crandles/confd,nevermosby/confd,glerchundi/confd,Fitbit/confd,karthequian/confd,chendh521/confd,beni55/confd,bacongobbler/confd,zytek/confd,okushchenko/confd,cloudnautique/confd,israelchen/confd,mboersma/confd,kelseyhightower/confd,tomdee/confd,bacongobbler/confd,philipsoutham/confd,karthequian/confd,agilemobiledev/confd,danesparza/confd,openedbox/confd,mboersma/confd,Ropes/confd,cloudnautique/confd,Lineberty/confd,openedbox/confd,linearregression/confd,shencan/confd,okushchenko/confd,gautamk/confd,PrFalken/confd,beni55/confd,blippar/confd,chendh521/confd,rancher/confd,rancher/confd,alexnauda/confd,philipsoutham/confd,say5/confd,axingblog/confd,elsonrodriguez/confd,gautamk/confd,kgrvamsi/confd,Flipkart/confd,jnummelin/confd,alexnauda/confd,elsonrodriguez/confd,agilemobiledev/confd,tomdee/confd,monder/confd,RichardKnop/confd,RichardKnop/confd,axingblog/confd,kgrvamsi/confd,jnummelin/confd,danesparza/confd,say5/confd