build: support io.js 1.x
build: support io.js 1.x

MadisonReed/session,hl198181/session,cnwhy/session,danielgindi/session,fracmak/session,cgcardona/session,expressjs/session,digitalartcrew/session,happysj/session,wesleytodd/session,Jpunt/session,tianyk/express-session-research,victorenator/session,tianyk/express-session-review,jasonkarns/session,soulman-is-good/session,globesherpa/session,socialrank/express-session,sielay/session,coolaj86/session,gabeio/session,saighost/session,mig1098/session