Add a compressor plugin for HTML output

Having compressed HTML is better, furthermore when there's trailing whitespaces due to the Liquid interpretor
I use the gist from mythartcher : https://gist.github.com/mytharcher/2758691
But I customized it for my own needs
Trailing whitespaces removal
FR - S'amuser avec les interactive playground
Add JSBin and CodePen options into the layout
Add proper whitespace since trailing ones are removed and HTML compressed
Compressor plugin corrections

Remove some blank lines
Correct the destination path for HTML files because of deployment conflicts (404.html path was not good)