[Feature request] Model documentation generator.

Hi! First of all, thanks for creating and open sourcing Epoxy, it really simplifies and optimizes developing features.

After extending the usage of Epoxy in a large app, and building dozens of components, we're facing a situation where sometimes models are duplicated because of members of the team don't realize they already exist.

Our suggestion would be to take advantage of the annotations and generate a centralized documentation or model catalog.

A similar tool in the react world could be React docgen

Thanks so much again for this awesome project!