Multiset library for Ruby

Ruby implementation of multiset. Unlike ordinary set(see Ruby documentation for "set" library), multiset can contain two or more same items.

Set[:a,:b,:c,:b,:b,:c] => #<Set: {:b, :c, :a}>
Multiset[:a,:b,:c,:b,:b,:c] => #<Multiset:#3 :b, #2 :c, #1 :a>

From version 0.12, methods Multiset#map, Multiset#map_with, and so on are added. Be careful that new Multiset#map is NOT equal to conventional Multiset#map(=Enumerable#map)!!
From version 0.13, installation with setup.rb is avaliable.
From version 0.20, multimap is implemented. Distributes as beta version for the time being.
From version 0.201, Multiset#classify and Multiset#classify_with returns an instance of Multimap.
I found my mistake that I did not attach the text of GNU LGPL for setup.rb . The text is attached from version 0.132 and 0.202. I am very sorry.

*This program is distributed under BSD license.

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