Merge pull request #2 from weshoke/master

Merge
Minor spelling corrections to README.md.
Starting render folder
Made a test file with a <canvas> for testing renderer
C2 updates
Merge branch 'master' of https://github.com/weshoke/versor.js
beginning renderer
Merge branch 'master' of https://github.com/weshoke/versor.js
Rendering for points and real and imaginary circles.
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.
simplified C2.dual function