Update cad.js to integrate into the vulcanforge visualizer framework. The following steps were necessary:

- update all urls to point relative to the file rather than the application root (e.g. /javascript/cad.js  ---> javascript/cad.js)
- add the visualizer utility file visualize.js and use that appropriately
Merge branch 'master' of https://github.com/ghemingway/cad.js
Merge branch 'master' of https://github.com/wgaggioli/cad.js