Update dependencies and devDependencies

Because the version of npm bundled with Node 0.8 is v1.2.30.
npm v1.2 doesn't support the `^` version specifier and [it causes an error when installing](https://travis-ci.org/jakubpawlowicz/clean-css/jobs/26472936).

Same as https://github.com/jakubpawlowicz/clean-css/pull/285#issuecomment-44795373