New parser comments / recommended changes

@HugoGiraudel here is a diff showing the changes I'm considering, and also some comments shown in context instead of just in a Gist convo.

__Refs:__ 
  + [New Parser Draft Gist](https://gist.github.com/HugoGiraudel/5614be5d1f02eb25c175)
  + https://github.com/HugoGiraudel/SassDoc/issues/20

> NO MERGE NECESSARY - CODE REVIEW ONLY