- Added $classes and $classes_array to all templates, not just Zen's templates.
- Renamed page.tpl's $body_classes and $body_classes_array to $classes and $classes_array
- #564068: Views classes are missing from $classes variable

#317417 by JohnAlbin and quicksketch: Fix off-line maintenance page since drupal_get_path('theme', 'zen') won't work

#375953: follow-up, change sidebar primary/secondary to first/second to match proposed D7 region names.

Removed path_to_zentheme() since we're not conditionally including wireframes.css or block-editing.css.

#306856: Optimize code by adding conditional includes; moved zen_preprocess_comment() to template.comment.inc.

#306856: Optimize code by adding conditional includes; moved block editing code to template.block-editing.inc.