pipe stdout, stderr streams of child proccess to main process in make.js
Show error if gmake or make not installed
Show 'gcc is required!' if gcc not installed on build
Add --nobg switch
Merge branch 'no-bg-switch' of https://github.com/kpcyrd/cjdns into crashey
fixes #597 and tested on macosx and Linux
Merge branch 'nix_Jmp_callback' of https://github.com/wfleurant/cjdns into crashey