Added header support;
Added footer support;
Added clonable elements support;
Added variable elements support;

this closes the issue #43
Added target _blank to all links on the presentation that do not start with # nor with javascript:
Added definition for the not found slide on the demo presentation
Added support to preloadImages settings...the splash screen, when enabled, will preload all the images if this flag is true
Added support to preload images even when not using the splash screen(by setting the preloadImages:true on the init method
Added some annotation comments to the missing methods
Added better comments to the source code on ppw.js file
Reorganized some source code definitions and comments
Adding keyboard shortcuts to the presentation tool.
They follow the same code that is used in ppw.js adding the Camera and
Thumbnail shortcuts
added missing -moz- transforms
Merge pull request #47 from filaruina/master

Adding Keyboard commands to the presentation tool
thanks to @filaruina
fixing the close-trigger element for the video tool
Added parallax theme, and a new fade theme;
Links now are always executed, even when the presentation has been locked
Added another trans fade theme
Added support for sending the language using the query string
Adding a diagram showing the html structure of classes and ids, that is built by power polygon
Added support to the presentation variables to have time.day, .month, .year, .hour, .minute and .day
Fixed problem with thm-parallax-1
Update README.md

Adding links to other demos.
Update README-pt.md

Adding extra demo talks links.