some component.json fixes


* include all the scripts from `lib` in the `component.json` `scripts` array
* add [component/url](https://github.com/component/url) and [component/object](https://github.com/component/object) dependencies to `component.json`
* update [LearnBoost/engine.io-client](https://github.com/LearnBoost/engine.io-client) dependency version to `0.4.1`