[AG-37] Extract license from Node.js package resource too, not only the version resource

[felipead]

The Node.js plugin only try to extract licenses or GitHub urls from the version resource (ex: http://registry.npmjs.org/foo/1.2.3). However, many licenses or GitHub urls are not declared in the version resource, but are available in the general package resource (ex: http://registry.npmjs.org/foo).

Here's an example where the license is declared in the package resource, but not in the version resource:

• version resource: http://registry.npmjs.org/noted/0.1.4
• package resource: http://registry.npmjs.org/noted