Slideshow Kwicks at boot

Here an add to *kwicks* behavior: **the slideshow**.
Based on your *examples/slideshow.html* file, I've integrated this behavior within the kwicks initialize.
By adding these options on the kwicks init object:

`{
  behavior: 'slideshow',
  showSpeed: 3.2
}`

The kwicks will automatically boot on slideshow mode with a delay of 3.2 seconds between each slide.

Of course, the new behaviour *'slideshow'* that let the user to select a panel but not to expand it, it's just a prototype.
Maybe we can discuss a better idea of what this behavior should do.