Update from 1.1.7 to 1.1.8.

Feature safe:	yes.

<ChangeLog>

*) Change: the ngx_http_limit_zone_module was renamed to the
   ngx_http_limit_conn_module.

*) Change: the "limit_zone" directive was superseded by the
   "limit_conn_zone" directive with a new syntax.

*) Feature: support for multiple "limit_conn" limits on the same level.

*) Feature: the "image_filter_sharpen" directive.

*) Bugfix: a segmentation fault might occur in a worker process if
   resolver got a big DNS response.
   Thanks to Ben Hawkes.

*) Bugfix: in cache key calculation if internal MD5 implementation was
   used; the bug had appeared in 1.0.4.

*) Bugfix: the "If-Modified-Since", "If-Range", etc. client request
   header lines might be passed to backend while caching; or not passed
   without caching if caching was enabled in another part of the
   configuration.

*) Bugfix: the module ngx_http_mp4_module sent incorrect
   "Content-Length" response header line if the "start" argument was
   used.
   Thanks to Piotr Sikora.

</ChangeLog>

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