Create new demo page

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