On the demo page, add a <pre> tag that shows the last run toastr command 

Relevant changes are in `index.html`, and include
- updating to jQuery 1.8.3 (not strictly necessary)
- including JSON.js from CDN
- adding a <pre> tag whose content is calculated whenever an example toastr bubble is created

Note: For no apparent reason Git seems to have changed all the newlines in a few files. Changes other than to `index.html` can be ignored.