def all_stars(arg = Time.current)
      extra_girls = []

      # args is Time or Date
      date = to_date(arg)

      if date
        last_all_stars_date = Rubicure::Movie.find(:stmm).started_date
        if date > last_all_stars_date
          date = last_all_stars_date
        end
      else
        # args is movie name
        movie = Rubicure::Movie.find(arg.to_sym)
        date = movie.started_date

        if movie.has_key?(:extra_girls)
          extra_girls = movie.extra_girls.map {|girl_name| Rubicure::Girl.find(girl_name.to_sym) }
        end
      end

      all_girls(date) - [Cure.echo] + extra_girls
    end
def all_stars(arg = Time.current)
      extra_girls = []

      # args is Time or Date
      date = to_date(arg)

      if date
        last_all_stars_date = Rubicure::Movie.find(:stmm).started_date
        if date > last_all_stars_date
          date = last_all_stars_date
        end
      else
        # args is movie name
        movie = Rubicure::Movie.find(arg.to_sym)
        date = movie.started_date

        if movie.has_key?(:extra_girls)
          extra_girls = movie.extra_girls.map {|girl_name| Rubicure::Girl.find(girl_name.to_sym) }
        end
      end

      all_girls(date) - [Cure.echo] + extra_girls
    end
Get precure all stars

 @param [Time,Date,String,Symbol] arg Time, Date or date like String (ex. "2013-12-16")

 @return [Array<Rubicure::Girl>]

 @example precure all stars
   Precure.all_stars.count
   Precure.all_stars.map(&:precure_name)
   # returns current precure count and names

   Precure.all_stars.include?(Cure.echo)
   #=> false

   Precure.all_stars("2013-10-26").count
   #=> 33

   Precure.all_stars(:dx).count
   #=> 14

   Precure.all_stars(:dx2).count
   #=> 17

   Precure.all_stars(:dx3).count
   #=> 21

   Precure.all_stars(:new_stage).count
   #=> 29
   Precure.all_stars(:new_stage).include?(Cure.echo)
   #=> true

   Precure.all_stars(:new_stage2).count
   #=> 32

   Precure.all_stars(:new_stage3).count
   #=> 37
   Precure.all_stars(:new_stage3).include?(Cure.echo)
   #=> true

   Precure.all_stars(:spring_carnival).count
   #=> 40

   Precure.all_stars(:sing_together_miracle_magic).count
   #=> 44
   Precure.all_stars(:sing_together_miracle_magic).include?(Cure.echo)
   #=> true