Ant-datrie

----------------

* datrie is rebuilt with Cython 0.19.1;
* ``iter_prefix_values``, ``prefix_values`` and ``longest_prefix_value``
methods for ``datrie.BaseTrie`` and ``datrie.Trie`` (thanks Jared Suttles).

------------------

* Recently introduced memory leak in ``longest_prefix``
and ``longest_prefix_item`` is fixed.

----------------

* ``longest_prefix`` and ``longest_prefix_item`` methods are fixed;
* datrie is rebuilt with Cython 0.18;
* misleading benchmark results in README are fixed;
* State._walk is renamed to State.walk_char.

------------------

* Update to latest libdatrie; this makes ``.keys()`` method a bit slower but
removes a keys length limitation.

------------------

* cPickle is used for saving/loading ``datrie.Trie`` if it is available.

----------------

* ``libdatrie`` improvements and bugfixes, including C iterator API support;
* custom iteration support using ``datrie.State`` and ``datrie.Iterator``.
* speed improvements: ``__length__``, ``keys``, ``values`` and
``items`` methods should be up to 2x faster.
* keys longer than 32768 are not supported in this release.