Update groonga to 4.0.5.

Release 4.0.5 - 2014/08/29
--------------------------

Improvements
^^^^^^^^^^^^

* Dropped Ubuntu 13.10 (Saucy Salamander).
* Supported to show weight vector element as XML.
* [ :doc:`/reference/functions/between` ] Supported outside of key range.
* [mruby] Changed to use Onigmo as regexp implementation.
* Added :doc:`/reference/functions/highlight_full` and
  :doc:`/reference/functions/highlight_html` which tags
  output text. [GitHub#185] [Patch by Naoya Murakami]
* [doc] Updated outdated functions/commands reference
  [GitHub#188] [GitHub#189] [Patch by Naoya Murakami]
* [benchmark] Added average and median in benchmark result.
* Exported :c:func:`grn_selector_func` and :c:func:`grn_proc_set_selector`
  for plugin developer. [GitHub#190] [Patch by Naoya Murakami]
* [ :doc:`/reference/commands/tokenize` ] Added "mode" option to control behavior.
  You can use ``GET`` or ``ADD`` as a mode.
  [GitHub#191] [GitHub#192] [Patch by Naoya Murakami]
* Supported near search by '\*N"A Z"' syntax.
* Supported to customize behavior of tokenizer whether it skips token or
  skips token with position. This feature is useful for developing tokenizer plugin.
  [GitHub#193] [Patch by Naoya Murakami]
* [doc] Updated description that a bug report is accepted in Japanese on GitHub issue tracker.
  [Reported by 6elz] [groonga-dev,02651]
* [doc] Updated tutorial in English. [GitHub#194] [Patch by cosmo0920]

Fixes
^^^^^

* [php] Fixed memory leak when :c:func:`grn_ctx_recv()` is used.
  [GitHub#184] [Patch by @do-aki]
* [php] Fixed to avoid double free when :c:func:`grn_ctx_close()` is called.
  [GitHub#184] [Patch by @do-aki]
* Fixed to support out-of-tree build again.
* [httpd] Updated bundled nginx version to the latest mainline (1.7.4). This update contains vulnerability fix.
* Fixed a bug that infinite loop occurs sometimes when updating indexes.
  [groonga-dev,02673] [Reported by MINAGAWA Sho]
* Fixed a bug that document frequency is invalid when
  :ref:`offline-index-construction` is used.
  [groonga-dev,02691] [Reported by Naoya Murakami]

Thanks
^^^^^^

* @do-aki
* Naoya Murakami
* 6elz
* MINAGAWA Sho
* cosmo0920

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