Switch back to curl 0.7.3 due to FF 3.6 not having document.scripts so that sauce tests can pass.
Switch back to curl 0.7.3 due to FF 3.6 not having document.scripts so that sauce tests can pass.

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