Changes with nginx 1.5.13 08 Apr 2014

    *) Change: improved hash table handling; the default values of the
       "variables_hash_max_size" and "types_hash_bucket_size" were changed
       to 1024 and 64 respectively.

    *) Feature: the ngx_http_mp4_module now supports the "end" argument.

    *) Feature: byte ranges support in the ngx_http_mp4_module and while
       saving responses to cache.

    *) Bugfix: alerts "ngx_slab_alloc() failed: no memory" no longer logged
       when using shared memory in the "ssl_session_cache" directive and in
       the ngx_http_limit_req_module.

    *) Bugfix: the "underscores_in_headers" directive did not allow
       underscore as a first character of a header.
       Thanks to Piotr Sikora.

    *) Bugfix: cache manager might hog CPU on exit in nginx/Windows.

    *) Bugfix: nginx/Windows terminated abnormally if the
       "ssl_session_cache" directive was used with the "shared" parameter.

    *) Bugfix: in the ngx_http_spdy_module.