Merge tag '141103' into 000000-dev

Tagging v141103
Merge branch 'master' into 000000-dev
Remove unused images
Adding new methods `\quick_cache\share\cache_lock()` and `\quick_cache\share\cache_unlock()`. These take of advantage of semaphores for file locking (if possible) with a fallback on `flock()` when `sem_get()` is not possible or fails. These methods are blocking, making it so that cache writes (including clearing, purging, wiping) all gain an exclusive lock on the cache directory while work is underway. This prevents issues like we have seen on very busy sites, reported in: websharks/quick-cache#288
Merge branch 'feature/288b' into 000000-dev
Bug fix related to home page cache auto-clearing. See: websharks/quick-cache#365
Merge branch 'feature/365' into 000000-dev
Adding `class_exists()` check to be sure to avoid any conflicts in ZenCache; if someone happens to enable both. Ugh. See: websharks/zencache#5
Soft fail on missing plugin file. See: websharks/zencache#5
Soft fail on missing plugin file. See: websharks/zencache#5
Merge branch 'feature/zc5' into 000000-dev
Releasing Quick Cache v141127 (Release Candidate)
Move `find_wp_config_file()` to share class.

See websharks/quick-cache#373
Use a site-specific unique IPC Key or Mutex during cache lock

See websharks/quick-cache#373
Remove `apply_filters()` from `find_wp_config_file()` return value

See websharks/quick-cache#373
Update default language files in preparation for v141204 release
Releasing Quick Cache v141204
Merge branch 'release/141127'