Add promise.fold to TOC, minor cleanup
Add promise.fold to TOC, minor cleanup

mlennon3/when,stevage/when,ning-github/when,petkaantonov/when,ning-github/when,frank-weindel/when,caporta/when,tkirda/when,DJDNS/when.js,frank-weindel/when,mlennon3/when,tkirda/when,stevage/when,anthonyvia/when,anthonyvia/when,SourcePointUSA/when,SourcePointUSA/when,caporta/when