Security: Mitigate DOM XSS vulnerability

Your version of the script is prone to DOM XSS attacks:
`parseHTML('<img src=x onerror=alert(1)>')` will execute the script immediately. This altered version prevents the execution of the script.

`$.parseHTML('<img src=x onerror=alert(1)>')` is still vulnerable to this attack, so generally it's not recommended to parse arbitrary HTML on the client side.
parseHTML(): Add IE8 compatible version
Update ie8.js
Remove secure ie8 version, as jq does not have any such security.
Merge branch 'pr/21' into gh-pages
rebuild