cdn 6.x-2.0-rc3

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-RC2:

• Fixed #942668: Fallback mechanism despite running Pressflow
• #948422: Minimize the amount of code loaded on each page: move hook_requirements() to the .install file
• #948454: Minimize the amount of code loaded on each page even further