circle: use node.js 5.1.0
circle: use node.js 5.1.0

jargv/gopherjs,jargv/gopherjs,bpowers/gopherjs,jargv/gopherjs,albrow/gopherjs,bpowers/gopherjs,albrow/gopherjs,gopherjs/gopherjs,gopherjs/gopherjs,gopherjs/gopherjs,gopherjs/gopherjs,albrow/gopherjs,gopherjs/gopherjs,bpowers/gopherjs