cdn 6.x-2.0-rc5

The goal for 2.0 is simple: make the CDN module kick ass. This will be done in three ways:

1. ✓ significant expansion of functionality
2. ✓ awesome UI
3. excellent documentation, including high-quality screencasts

IMPORTANT NOTE:
The Drupal core patch has changed in beta 6 (not in this RC)! So, before updating, revert the patch of beta 3 (or from beta 2, if you're upgrading from beta 2). Then update the code. Then apply the new patch.

Changes since DRUPAL-6--2-0-RC4:

• Fixed #956778: Fallback mode always enabled at admin/settings/cdn* and admin/reports/status
• Slight performance improvement in cdn_file_url_alter().
• Fixed #956164: Eval'd PHP code version of cdn_pick_server() not working + improve docs