JCLOUDS-232: Changes to follow ASF branding

Changes to follow ASF branding:

* Added missing navigation links.
* Changed from "jclouds" to "Apache jclouds" in page titles and main sections.
* Updated links to the new mailing lists.
* Appended the &reg; character to the main "jclouds" that appear in the landing pages.

Please, comment and give feedback if there is a better way to make it a good-looking site, and if there is still some link/whatever that should be changed!