The generated JSDoc should not have so many erroneous globals

[Before](montagejs.org/api/global.html).

After: 
![after](https://f.cloud.github.com/assets/55838/1338971/bfcdd854-35f3-11e3-8703-04a3cddcb923.png)

I don’t know where to put [exports.resolve](https://github.com/montagejs/montage/blob/master/core/url.js#L331) and exports.relative. They are not global yet they don’t belong to any class. I’m open to suggestions.