Use chrome-launcher to launch Chrome when using Chromeless locally

[adieuadieu]

Use chrome-launcher to launch Chrome when using Chromeless locally. Then we don't have to explain to users that they need to have Chrome running for Chromeless to work locally.

[joelgriffith]

I'd love to tackle this. Would be a huge improvement (and it's not too big a change)

[joelgriffith]

#120 should resolve this and a few other issues I've seen

[adieuadieu]

Closing this as #120 was merged.