[collections] OrderedMap added

[Henri Yandell <ba...@generationjava.com>]

I've added the OrderedMap decorator.
org.apache.commons.collections.decorators.OrderedMap.

I've never implemented a Map this stringently before, so if anyone has any
criticism I'd love to hear it. Usually I don't bother to obey the spec
fully on values/entrySet/keySet.

I've used the same paradigm for all three of the 'views', so once you see
how I've done one, the others should be boring.

Need to get some more unit tests in TestMap.

Hen


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