Revamp the site.

* Use Foundation 3 for a better look and typography
* Use Orion editor everywhere
* Add useful description to every example

https://code.google.com/p/esprima/issues/detail?id=404
Parser demo: use sm-treeview for the syntax visualization.

For a better performance and an improved look, drop the old TreeView
and use sm-treeview.

https://code.google.com/p/esprima/issues/detail?id=404