Refs #1711 - simplifying code: now homepage/license links link directly to the URL, and would expose referer. This is not an issue as, a plugin could anyway obtain a lot more information about the server anyway. In code, all URLs using Proxy&action=redirect are Piwik.org URLs.

git-svn-id: http://dev.piwik.org/svn/trunk@3360 59fd770c-687e-43c8-a1e3-f5a4ff64c105