Spinner (CO-581), Sidebar (CO-822), co_people index, edit, view (CO-772)

CO-581 includes a check for HTML5 validity, allowing us to turn off the spinner explicitly if a browser stops on a validation error

CO-822 Sidebar now floats right and responsively degrades to the top of the content on smaller device widths

CO-772 includes numerous layout updates to the co_people index, edit, view/compare; also includes stylistic updates to petition form