Improve CanJS detection in Library-Detector-for-Chrome

[Library-Detector-for-Chrome](https://github.com/johnmichel/Library-Detector-for-Chrome) is a project that detects what libraries are used on page. It’s used by projects like [HTTP Archive](https://discuss.httparchive.org/t/javascript-library-detection/955) for providing stats on what libraries are popular.

It [detects CanJS](https://github.com/johnmichel/Library-Detector-for-Chrome/blob/bf53504cd2522cf57fe39b31a984869c9e94c33c/library/libraries.js#L1009-L1018), but I’m not sure if it’s robust enough to catch CanJS 3 projects. It’d be nice if we submitted a PR that could make it work with newer CanJS apps.