searching for {'propertyName' : None}  and {'propertyName.subProp' : None} was inconsistent with MongoDb
allow with_limit_and_skip to be passed to cursor count method
Merge pull request #92 from texuf/master

searching for {'propertyName' : None}  and {'propertyName.subProp' : Non...
Merge pull request #93 from emirose/cursor_count_method_with_arg

allow with_limit_and_skip to be passed to cursor count method
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