Always creating a new instance of KOSapiClient instance in specs.
Added a transaction block for whole parallel import.
UpdatedParallelsFinder now accepts since argument in find_updated method.
Renamed KOSapiPartialParallelImport to PartialParallelImport.
Passing finder instance instead of Class constant.
Extract some MethodChain methods and add them to then

Method names clash with standard functionality, so
we want to limit monkey patching as much as possible.
Fix date filtered spec