Don't clear cookies for non-cached responses

Add optional cached_response_filter

Use ngx.print for writing response body so it comes out unmodified

Average 60 sec hit count with 30 sec for windowed hit count

Properly log local hits for 304s

Lower default min hit count

Remove separate locks memory area. Properly use metadata area for met…

…adata.

Split local store by usage to limit fragmentation

Split by usage into 3 sections

One for locks: cache_locks
One for metadata: cache_metadata
One for entities: cache_entities

Flush expired keys from local store after every request

Increase skip store time to 30 seconds