Added a new look to the IVLE header bar. Mmmm... Web 2.0. Added top-level directory image-source, containing SVG and script files for generating the images. ivle/webapp/coremedia/images: Added 'chrome' directory containing the rendered images. Modified ivle/webapp/base/ivle-headings.html and ivle/webapp/coremedia/ivle.css to support the new images. Note that the H1 and H2 at the top of the page are no longer displayed (and their custom styles have been removed). There is a heading image instead.