authcache 6.x-1.0-rc2

RELEASE CANDIDATE 2

- Made "Disable caching for this browser session" nocache option not receive cached pages

- Fix for Memcache API 6.x-1.4 for flusing expired cache tables
#683108: authcache with memcache serves old content.

- Changed rulesets for caching roles: "authenticated user (without additional roles)" doesn't need to be checked to enable caching for other roles.
#586934: Explain that "authenticated user" role is required by other user roles

- Prevent Ajax requests from being cached
#603700: "Authcache Footer JSON" text being appended to ajax JSON when full bootstrap is done.

- In debug mode, display all Authcache Ajax requests called via Authcache.ajaxRequest();
#628712: Ajax callback not even called for authcache_example module (hidden parsererror)

- More specific form token handling code (help prevent Validation Errors when using certain contributed modules)
#670238: Validation Error

- Delete authcache_debug cookie if debugging is disabled
(Had to remove "authcache_debug" page to support this feature)
#595506: Debugging options are not taken into account unless the cookie is deleted

- W3C valid script tags
#581856: not w3c valid

- Misc. Drupal code standards cleanup