ISIS-537: getting rid of current CSS

* any of Isis' current CSS
* Isis' cssreset.css script
* any of Isis' custom Javascript (for the sliding div, and the veil)
* current use of bootstrap for grid layout
* the CSS for the sliding div bookmark.

still remaining:
* the CSS for Igor's select2.  This is brought in by his component.
* the CSS for JGrowl.  Might keep for the moment.