Marisa-trie-m

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* New ``Trie`` methods: ``__getitem__``, ``get``, ``items``, ``iteritems``.
``trie[u'key']`` is now the same as ``trie.key_id(u'key')``.
* small optimization for ``BytesTrie.get``.
* wrapper is rebuilt with Cython 0.20.1.

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* small ``Trie.restore_key`` optimization (it should work 5-15% faster)

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* fix ``Trie.restore_key`` method - it was reading past declared string length;
* rebuild wrapper with Cython 0.20.

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* ``has_keys_with_prefix(prefix)`` method (thanks
`Matt Hickford <https://github.com/matt-hickford>`_)

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* ``BytesTrie.iterkeys``, ``BytesTrie.iteritems``,
``RecordTrie.iterkeys`` and ``RecordTrie.iteritems`` methods;
* wrapper is rebuilt with Cython 0.19;
* ``value_separator`` parameter for ``BytesTrie`` and ``RecordTrie``.

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* improved trie building: ``weights`` optional parameter;
* improved trie building: unnecessary input sorting is removed;
* wrapper is rebuilt with Cython 0.18;
* bundled marisa-trie C++ library is updated to svn r133.