Module update: Bootstrap Panel Layouts

IAEA_panels_bootstrap_layouts_style_region_render function had to be overridden to make custom layouts work. Add name of your layout into the $layouts array

Signed-off-by: Kresimir Nikolic <kresimir.nikolic@gmail.com>
Theming: static HTML templates update. Video page added. Sidebar navigation restyled (to be finished)

Signed-off-by: Kresimir Nikolic <kresimir.nikolic@gmail.com>