Add the following CSS to the top of your themes custom.css file
http://snippi.com/s/yml1729
Next when creating a slide item add you image to the content sections like this when you upload it inserting the large image into the post content editor, also don't link this image, don't add a featured image.
http://cld.wthms.co/jpEb
This will now display our image full width in the slider
http://cld.wthms.co/y8f2