By kiam: Updated the information contained in the frontpage.info file to the latest version of Drupal.

By kiam: Changed the code to depend on branch 2.x of the Variables API module; removed the call to drupal_load() where not necessary.

By kiam: Added the code to allow third-party modules to alter the frontpage rendering array, and the URL to which the user is redirected when the frontpage node is not loadable or set.

Initial commit of Frontpage module. The module allows to set a node as frontpage for anonymous, and authenticated users.