Revert "Added in helper methods to MongoCollection for allowing strings to be passed as queries"

This reverts commit c4ce27dfd9c75539e6e7c614bfdfa4cb6b5d50d0.
Revert "Added the ability to create query documents based on native MongoDB queries"

This reverts commit af639ffb87305cb51c29d405be36f77404f2bff0.