Fix search for virtual and association columns (#669 http://code.google.com/p/activescaffold/issues/detail?id=669)
Fix search for virtual and association columns (#669 http://code.google.com/p/activescaffold/issues/detail?id=669)

AlbertoBarrago/active_scaffold,asoltys/active_scaffold,AlbertoBarrago/active_scaffold,activescaffold/active_scaffold,vhochstein/active_scaffold,silverpond/active_scaffold,budree/active_scaffold,mallikarjunayaddala/active_scaffold,budree/active_scaffold,asoltys/active_scaffold,activescaffold/active_scaffold,activescaffold/active_scaffold,mallikarjunayaddala/active_scaffold,ajacksified/active_scaffold,BookingBug/active_scaffold,silverpond/active_scaffold,BookingBug/active_scaffold,mallikarjunayaddala/active_scaffold,ajacksified/active_scaffold,budree/active_scaffold,silverpond/active_scaffold,vhochstein/active_scaffold,AlbertoBarrago/active_scaffold,vhochstein/active_scaffold,BookingBug/active_scaffold