Create new demo page

- [ ] Start from http://code.ovidiu.ch/dragdealer/
- [ ] Incorporate running Jasmine tests
- [ ] Feature (fixed #7) click events inside handle
- [ ] Redirect from http://code.ovidiu.ch/dragdealer/ to `gh-pages`
- [ ] Cross-browser support (link IE6 to comment where it says it doesn't run on SauceLabs)