fix for issue #904, also includes a test which checks the error case …#1248

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ms5 wants to merge 2 commits intoMongoEngine:masterfrom

ms5:fix_904_incl_test

Commits on Mar 8, 2016

fix for issue #904, also includes a test which checks the error case I reported in the issue report.
ms5
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python 3 code is handled by 2to3; test for db_field translation to and from SON.
ms5
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