Small tweaks from issue #23

The sum of the changes are
* Updated jQuery to newest
* Defaults idle=true when monitoring "document" 
* Fixes startImmediately (if users set idle config, and it still startImmediately, it would toggle incorrectly)
* Stops event propagation on textarea
* Update demo page with bootstrap

You can view the updated demo here: http://thorst.github.io/jquery-idletimer/

The only thing that would need changed are the urls in the demo page.