Fix missing C2 typo in C2.js
Add a renderer for point pairs.

Renders as two points connected by a grey line. The points are blue if this is a real point pair, and red if this is an imaginary point pair.
Merge branch 'master' into point-pair
Add C2.dual
Add rendering of directly represented circles, i.e. trivectors.
Add comments to the render test elements.
Normalize bounds in setter so that our map functions work correctly.
Add line renderer.
Move point pair to make test slightly less visually confusing.
Merge pull request #5 from weshoke/point-pair

Add a renderer for point pairs.