Sort version number strings properly

version_sort.rb

# Turn version number into a 48 bit value (16 bits per version number) that is comparable to other versions
def rank_version(ver_str)
  ver_str.
    split('.').
    map(&:to_i).
    reduce([5*16,0]) {|acc,v| #These vars are horribly named
      i,a=acc
      [i - 16, a | (v << i) ]
  }[1]
end