Elasticsearch-dsl

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* added support for (index/search)_analyzer via 143, thanks wkiser!
* even keys accessed via ``['field']`` on ``AttrDict`` will be wrapped in
``Attr[Dict|List]`` for consistency
* Added a convenient option to specify a custom ``doc_class`` to wrap
inner/Nested documents
* ``blank`` option has been removed
* ``AttributeError`` is no longer raised when accessing an empty field.
* added ``required`` flag to fields and validation hooks to fields and
(sub)documents
* removed ``get`` method from ``AttrDict``. Use ``getattr(d, key, default)``
instead.
* added ``FacetedSearch`` for easy declarative faceted navigation

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* Metadata fields (such as id, parent, index, version etc) must be stored (and
retrieved) using the ``meta`` attribute (58) on both ``Result`` and
``DocType`` objects or using their underscored variants (``_id``,
``_parent`` etc)
* query on Search can now be directly assigned
* ``suggest`` method added to ``Search``
* ``Search.doc_type`` now accepts ``DocType`` subclasses directly
* ``Properties.property`` method renamed to ``field`` for consistency
* Date field now raises ``ValidationException`` on incorrect data

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Added persistence layer (``Mapping`` and ``DocType``), various fixes and
improvements.

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Fix for python 2

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Initial release.