comment out asserts in unify.py
unify/reify_tuple -> unify/reify_seq
list unification test cases
reify_seq -> reify_tuple and reify_list
clean up Foo/list test
add multihash
run uses unique(key=multihash)
style edits - align dicts.  Separate run line
reify list unit tests
raise TypeError for non-covered hash type
Merge pull request #20 from mrocklin/jaberg-list

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