add travis yml Add travis env according with https://github.com/travis-ci/travis-ci/issues/4771#issuecomment-139062629
add travis yml
Add travis env according with
https://github.com/travis-ci/travis-ci/issues/4771#issuecomment-139062629

karlwestin/node-gumbo-parser,karlwestin/node-gumbo-parser,karlwestin/node-gumbo-parser,karlwestin/node-gumbo-parser