cdn 6.x-2.2

Version 2.1 was already very stable. This release fixes all known bugs.

Major new functionality:
- Far Future expiration support
- Advanced Help support
- hook_cdn_blacklist(): modules can now blacklist files that should not be served from a CDN

Changes since 6.x-2.1:

• Follow-up patch for #1413162: only call theme('advanced_help_topic', …) when Advanced Help is enabled.
• Fix authenticated user blacklist.
• Minor follow-up patch for #974350.
• Follow-up patch for #1413162: only perform the Advanced Help check once on the CDN admin pages.
• Follow-up patch for #1413162; the previous commit contained a small error.
• Undo the accidental commit of the current patch for #1413156.
• Minor cleanup.
• #1413162 by bendodd and wimleers: Advanced Help support
• Follow-up patch for #1070938; move '*image_captcha/*' from the hardcoded default blacklist into CDN's hook_cdn_blacklist() implementation.
• Follow-up patch for #1070938; remove '*.js' from the default blacklist.
• Follow-up commit for #974350; add a reference/recommendation for the advagg module.
• Fixed #1404074: Notice: Use of undefined constant CDN_THEME_LAYER_FALLBACK_VARIABLE during installation
• #1412552: File Conveyor now supports origin file deletion; don't break down when this is used
• #968614: Link to Amazon CloudFront custom origin docs
• #1070938: Support hook_cdn_blacklist() and hook_cdn_blacklist_alter() to deal with same-origin policy more flexibly
• #1097742 by BManuel and wimleers: Dumb proof setup for Origin Pull mode
• #1344948: Update README.txt to remain in sync with the one for D7
• Fixed #1236008: Ensure compatibility with File Conveyor 1.0
• Fixed #1080716: Drupal path blacklist: move the admin* blacklisted path
• Follow-up patch for #970632
• Fixed #1233298 by pebosi: Protocol becomes 'httpss' if file already served via 'https'--author=pebosi
  
• #1345486: ImageCache patch no longer necessary as of version 2.0 beta 12
• Fixed #1165404: Thumbnail served from CDN but not the original image
• Follow-up patch for #974350: ctools #dependency bugfix.
• #974350 by bendodd and Wim Leers: Far Future setting for Origin Pull mode
• Fixed #1138252 by drewish: Touch links don't include redirect back to previous location
• Fixed #1272408: Possible division by zero in theme.inc when `touch`ing file through UI
• Fixed #1230468: include_once in cdn.install
• Fixed #1151752 by pwaterz, pfournier and Wim Leers.
• Follow-up patch for #1064912: Provide internal setting to stop CDN from verifying the ImageCache patch
• Minor fix that ensures correct URLs in the per-page statistics.
• #1064912 by bibo: Provide internal setting to stop CDN from verifying the ImageCache patch.
• #1061588 by rjbrown99 and Wim Leers: Document problem with CSS file URL rewriting when using template_preprocess_page().
• #1084910 by Wim Leers: The following enabled modules are incompatible with aggressive mode caching and will not function properly: cdn.
• #1039176 by Wim Leers, tseven: Cocomore's version of drupal not detected as patched.
• #1047182 by Vacilando, Wim Leers: Document that HTTPS breaks if one uses a vanity subdomain (CNAME) for a CDN that supports HTTPS requests.
• Stripping CVS keywords