Fix "invalid asm.js warning" in firefox
Fix "invalid asm.js warning" in firefox

For #22.
See https://github.com/feross/webtorrent/issues/281

corona6/instant.io,jhiesey/instant.io,loon3/instant.io,TribeMedia/instant.io,jhiesey/instant.io,VoR0220/instant.io,feross/instant.io,TribeMedia/instant.io,corona6/instant.io,cesar2535/instant.io,joeldom/instant.io,bradparks/instant.io,TribeMedia/instant.io,bradparks/instant.io,loon3/instant.io,feross/instant.io,corona6/instant.io,loon3/instant.io,cesar2535/instant.io,cesar2535/instant.io,jhiesey/instant.io,feross/instant.io,VoR0220/instant.io,joeldom/instant.io,bradparks/instant.io,VoR0220/instant.io,joeldom/instant.io