Add an .outline() method to some Draw types using polyline geometry.

[mitchmindtree]

Outlines are commonly used throughout Processing and as a result, this is blocking quite a few of the examples #86.

This could be done by creating a polyline to surround the geometry using the geom::line::join::miter items.

Shapes that should support outline include:

• rect
• ellipse
• polygon
• quad
• tri

Styling options for the outline should include:

• thickness
• color
• join