jsbox as PRE tag replacement

[marcopeg]

JSBox should be used just as PRE/CODE tag replacement:

<pre data-jsbox>alert('hello world');</pre> 
<pre data-jsbox data-html><h1>Hello World</h1></pre>
<pre data-jsbox data-css>h1 { color:red }</pre>

The main focus should be on Javascript because there is the great benefit to show code and run it live with the possibility of modifications.

NOTE: This should be just a simple modification of the jQuery plugin layer in order to recognise this particular syntax in the page.