Patch thanks to chx.

Minimally updated README and INSTALLATION docs.
NOTE: memcache.db.inc and memcache-session.inc are note yet ported.

  * Fixed SQL Error in memcache.db.inc
  * Added CACHE_TEMPORARY memcache caching to memcache.db.inc (full page cache and other things weren't going in)
  * Small code cleanup in memcache.db.inc
  * Changed MENU_DEFAULT_LOCAL_TASK to MENU_LOCAL_TASK in memcache_admin.module
  * Updated README.txt for memcache-session.inc

Added:
  * patches directory to hold all of the patches
  * Drupal 5.0 - 5.6 patches for core

Removed:
  * Old core serialization patch that only "kinda" applied to certain versions. Should be easier
    to know which version to use now.