Use Go 1.7 for travis-ci
Use Go 1.7 for travis-ci

helight/helight_code,helight/helight_code,helight/helight_code,helight/helight_code,lightpaw/go-zookeeper,helight/helight_code,helight/helight_code,helight/helight_code,helight/helight_code,helight/helight_code