Add support of "bson.dbref.DBRef" data type for formatting value. The…#692

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burnettzhong wants to merge 3 commits intoyougov:masterfrom burnettzhong:master

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Commits on Apr 3, 2017

Add support of "bson.dbref.DBRef" data type for formatting value. The "bson.dbref.DBRef" is used by Solr DBRef.
burnettzhong
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Add support for DBRef. Now it normalized DBRef.collection, DBRef.database and DBref.id.
burnettzhong
committed
Add dollar sign as prefix of DBRef values. Stay same syntax with MongoDB.
burnettzhong
committed