Added to_str() method for HashMap and HashSet#6414

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bors merged 9 commits intorust-lang:incomingfrom

samebchase:experimental

May 12, 2013

Commits on May 10, 2013

Add to_str() for HashMaps, and some basic tests as well.
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Removed test_hashmap() for the time, being. All tests pass with make check.
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Commits on May 12, 2013

Add use declaration for container::Set
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