building-blocks v0.2.1

This is a minor release with a few improvements to make v0.2 more usable.

• The docs generated for docs.rs will now use all features.
• The Point2 and Point3 types now support conversion to/from the mint::{Point2, Point3, Vector2, Vector3} types.
• Some parts of the docs around storage have been improved. It should be easier to navigate to the most important pages for getting started.