DATAMONGO-600 - Fixed parameter binding for derived queries on properties using polymorphism.

We need to retain the type in the serialized DBObject in case a derived query binds parameters for properties that use polymorphism as we serialize the object as nested document and this only matches in an all-or-nothing way. So if the type information is missing, we won't see any results.

So we now hand the TypeInformation of the property into the conversion logic and transparently skip the type information removal in case the types differ. Upgraded to Querydsl 2.8.2 as it fixes a bug regarding the APT processing which the test cases would stumble into otherwise.