Fix links_for_associations for polymorphic associations
Fix links_for_associations for polymorphic associations

activescaffold/active_scaffold,mallikarjunayaddala/active_scaffold,AlbertoBarrago/active_scaffold,budree/active_scaffold,activescaffold/active_scaffold,AlbertoBarrago/active_scaffold,AlbertoBarrago/active_scaffold,mallikarjunayaddala/active_scaffold,budree/active_scaffold,mallikarjunayaddala/active_scaffold,budree/active_scaffold,activescaffold/active_scaffold