Mongokit

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* support latest pymongo version
* some changes in GridFS support (please read http://namlook.github.com/mongokit/gridfs.html)
* Deprecate atomic_save feature
* remove libmagic import from grid.py : to many trouble with this lib, we have to find another way to guess the content-type
* fix 79 -- Tries to migrate non-saved document
* fix 70 -- Set changes from set to list when a validation error occurs
* add contributor + fix email address to prevent spam
* fix deprecation warning of Python 2.6
* fix issue with validation and migration
* fix 75 -- add "version" attribute to module

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* fix bug in autorefs when reference in double list

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* minors fixes

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* add rewind to cursor
* killed many bug in `from_json()`
* fix 66 - local variable 'l_objs' referenced before assignment
* fix 61 - Issue with indexing on multi-columns with directions

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* fix 63 - Creating index for each document instance operation. Brings speed improvements
* fix 60 - autorefs doesn't work with complex structures
* fix 62 - Dereference to model. Thanks to Christian Joudrey for the patch
* fix 64 - error with atomic_save when using embed document
* fix 65 - Lazy migrations with dict in list and documentation fix

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* add `atomic update`_ (just save the document again)
* add `init_type`_ to CustomType. This allow to fill an empty skeleton at instanciation
* add debian package build rules. Thanks to Sebastien Estienne
* add `lazy migration`_ and `bulk migration`_ support
* fix a bug in CustomType
* add `'check' option`_ in indexes descriptor
* add `untyped field support`_
* fix 58 - Document Validators not working for CustomType
* improve DotCollapsedDict by adding reference structure


.. _`atomic update` : http://namlook.github.com/mongokit/tutorial.htmlupdating-data
.. _`init_type` : http://namlook.github.com/mongokit/tutorial.htmlcustom-types
.. _`lazy migration` : http://namlook.github.com/mongokit/migration.html
.. _`bulk migration` : http://namlook.github.com/mongokit/migration.htmlbulk-migration
.. _`'check' option` : http://namlook.github.com/mongokit/tutorial.htmlindexes
.. _`untyped field support` : http://namlook.github.com/mongokit/tutorial.htmluntyped-field