fixed bug for `form_ui = :select` and has_many associations. the options for a has_many associations usually exclude already-associated  records, and the plural_association_select code wasn't adding the existing associations back in. this was a regression from 1.0.
fixed bug for `form_ui = :select` and has_many associations. the options for a has_many associations usually exclude already-associated 
records, and the plural_association_select code wasn't adding the existing associations back in. this was a regression from 1.0.


PiRSquared17/activescaffold,PiRSquared17/activescaffold,PiRSquared17/activescaffold