Update zookeeper download URL and switch to 1.3.1 for travis
Update zookeeper download URL and switch to 1.3.1 for travis

helight/helight_code,lightpaw/go-zookeeper,cch123/go-zookeeper,rajivreddy/go-zookeeper,helight/helight_code,dallasmarlow/go-zookeeper,helight/helight_code,ChannelMeter/go-zookeeper,helight/helight_code,zenoss/go-zookeeper,hailocab/go-zookeeper,mondough/go-zookeeper,kmiku7/go-zookeeper-annotated,helight/helight_code,helight/helight_code,aybabtme/go-zookeeper,theckman/go-zookeeper,helight/helight_code,helight/helight_code,mikeqian/go-zookeeper,wickman/go-zookeeper,helight/helight_code