[MERGE] Implement and test Tree.get_file_sha1 and Tree.__contains__ for previewtree

[Aaron Bentley]

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Hi all,

This patch adds PreviewTree.get_file_sha1 and PreviewTree.__contains__,
and tests them using tree_implementation tests.

Until now, __contains__ has been provided by assigning Tree.has_id to
__contains__.  However, this approach means that overriding has_id in a
subclass fails to change the implementation of __contains__.

Aaron
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