created option level model
added all_blank? method to translatable
refactored option to use all_blank?
fixed schema/erd
added validation to option level and tested
ensured ranks of option levels are contiguous and tested
added parent and option level to optioning
added mocha
ensured optioning has parent if necessary
add multilevel attrib to option sets
ensured optioning has option level if option set is multi level
removed some old code from option set
fixed optioning test
made option levels mandatory for multilevel option sets
added forgotten _name column to option level table
fixed bug in standardizable
added ensure_contiguous_ranks method to Array
added recursive contiguous rank checking
added to_s for multilevel option set
refactored association names