added isSubType function
Merge branch 'master' of https://github.com/weshoke/versor.js
Update cli/index to allow entering drawing commands.

Adds basis blades to the parser, and a special case method for drawing the e3 object.
Add fallback dispatch in draw code for unknown types.
Fix jshint problems in C2canvas.
added tangents
Merge branch 'master' of https://github.com/weshoke/versor.js
added tangents