Add support for filtering/omitting nested fields based on django style path expressions #16
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This PR attempts to add support for filtering nested fields using standard django style path expressions via the
__
separator. One of the projects I am working on uses DRF in conjunction with mongoengine and being able to filter the nested fields is important for us as we end up with nested structures quite often that we filter at the mongo layer and without this we end up with fields coming back as null instead of removing them.