Merge pull request #2 from PauloASilva/master

fix: proxy.listen option
Merge pull request #3 from PauloASilva/master

proxy.listen() documentation update. modifyGoogle test fix
fix #4 openport dependency removed. Free port scan/find now relies on node.js's https.listen()
Merge pull request #5 from PauloASilva/openport-refactoring

fix #4 openport dependency removed. Free port scan/find now relies on no...