Write tutorials

[revarbat]

Need to write library tutorials.

Tutorials to write:

• [x] Basic Shapes
• [x] Transforms, Distributors, and Mutators
• [x] Anchor, Spin, Orient
• [ ] Edge Sets and Face Sets
• [ ] Complex Standard Shapes
• [x] Attachments, Tags, Masking
• [ ] Making a Polyhedron with VNFs
• [ ] Beziers and Bezier Patches
• [x] Paths and Regions
• [ ] Skinning and Sweeping
• [ ] Rounding
• [x] Fractal Tree Demo