Add delay slider

This adds a "delay" attribute to the slider that prevents the model from updating until the user has stopped moving the slider for the specified amount of time. I adapted [this Stackoverflow answer](http://stackoverflow.com/a/3694388).

My use case is that I have a slider which causes things to be drawn on a Google map based on the response from an http service that depends on the slider value. The normal slider changes were so quick that the http request and drawing isn't able to keep up.

This is different from the slider event listeners because with event listeners, the stop event only fires when the slider has been released. This delay feature causes the model to be updated when the slider has been stopped moving but not necessarily been released.

I've added a 13th example to the demo page that makes use of the new delay attribute.

There is also a fix for the demo page. A fresh ```bower install``` places the jquery javascript in ```bower_components/jquery/dist/jquery.min.js``` but the current script tag omits the ```dist``` folder. I've added it in so this may require a ```bower update``` for the demo to work.