amberc.js: add support for specifying an ouput directory for the generated .js files
amberc.js: add support for specifying an ouput directory for the generated .js files

amber-smalltalk/amber,adrian-castravete/amber,matthias-springer/amber-athens,amber-smalltalk/amber,amber-smalltalk/amber,matthias-springer/amber-athens,matthias-springer/amber-athens,adrian-castravete/amber,adrian-castravete/amber