memcache 7.x-1.0-beta2

Fixes DRUPAL-SA-CONTRIB-2010-098.

Changes since DRUPAL-7--1-0-BETA1:

• Bug #525400: hash keys if longer than 250 bytes, as otherwise they get
  truncated by memcache leading to collisions.
• Push some more fixes.
• Fix dmemcache_add to use $full_key.
• Bug #788436: Remove accidental pass-by-reference from getMultiple. Patch thanks to Catch.
• Bug #810306: remove debug logging calls.
• Add ability to set options with memcached PECL package. Set sane defaults. Document. Patch thanks to nnewton.
• Simplify wildcard logic, alleviate lock contention when flushing a large number of different wildcards.
• Fix variable typo (thanks catch), and make it possible to disable hashes altogether.
• Bug #828664, from core bug fix.
• Be sure ->flushes exists before using it.
• #900436: Optimize memcache::valid(), only check wildcards when necessary.
• #925096 by robertDouglass: Fixed Use of REQUEST_TIME improper, incomplete.
• Updating README requirements
• #911226 by robertDouglass: Added Improved statistics reporting.
• #856276 by nycnate, srjosh | whytewolf: Fixed Call to undefined method Memcached::getExtendedStats().
• #925096 by robertDouglass | swentel: Fixed Use of REQUEST_TIME improper, incomplete.
• whitespace
• Tweaking stats and sessions.
• #854516 by longwave: document use of OPT_BINARY_PROTOCOL and don't make it the default.