Test Node.js 4 instead of io.js
Test Node.js 4 instead of io.js

See jadejs/jade#2083.

magicdawn/jade,pugjs/then-jade,Laoujin/jade,omixen/jade,ridixcr/jade,illusionfield/jade,jadejs/then-jade,magicdawn/jade,coderhaoxin/jade,cgvarela/jade,illusionfield/jade,ridixcr/jade,Victorgichohi/jade,angryrobot/jade,Laoujin/jade,hnag409/jade,pugjs/jade,ceremcem/jade,colin-h/jade,hnag409/jade,jadejs/then-jade,Shinchy/jade,angryrobot/jade,pugjs/then-jade,colin-h/jade,omixen/jade,Shinchy/jade,pugjs/pug,pugjs/pug,pugjs/jade,coderhaoxin/jade,cgvarela/jade,Victorgichohi/jade