Added max & min items to collection regions.
Added max & min items to collection regions.

filipjansson/piranha.core,PiranhaCMS/piranha.core,filipjansson/piranha.core,GyreTechnologies/piranha.core,filipjansson/piranha.core,PiranhaCMS/piranha.core,PiranhaCMS/piranha.core,GyreTechnologies/piranha.core,GyreTechnologies/piranha.core,PiranhaCMS/piranha.core