cdn 6.x-2.0-beta6

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

This is the last beta before the RC stage!

IMPORTANT NOTE:
The Drupal core patch has changed in this beta! 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-BETA5:

• Fixed #928608: Document requirement for PDO and pdo_sqlite
• #703042 by rwohleb and wimleers: Make it easy to use multiple subdomains without using a CDN — i.e. make the Parallel module obsolete
• The human name for 'basic mode' is now 'Origin Pull mode' and for 'advanced mode' it has become 'File Conveyor mode'. Updated the documentation and strings accordingly.
• Renamed the module from 'CDN integration' to 'CDN'.
• Another follow-up fix for an edge case in #839282 by jcmarco: Problems with shipped files and Drupal 6 file_create_url() behavior.
• Further minor README cleanup.
• #893088 by wimleers: Smart defaults for excluding JS files from CDNs: not only allow for a blacklist, but also a whitelist
• Fixed all coder warnings.