Fix has and belogns to many, so it calls remove_relationship on the right object.
Merge pull request #53 from projecthydra/fix-habtm

Fix has and belogns to many, so it calls remove_relationship on the righ...
remove @owner.new_record? check from the association collection append operator; do that check in insert_record as needed instead.
Merge pull request #54 from projecthydra/af-association-new-records-fix

remove @owner.new_record? check from the association collection append o...