Use md5 hashes of hg diffs instead of including the full text.

Review Request #5114 — Created Dec. 13, 2013 and submitted — Latest diff uploaded

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RBTools
master

Reviewers

Use md5 hashes of hg diffs instead of including the full text.

This shortens our test file a bit by checking that the hash of the diff matches
what we expect, rather than just comparing long text strings.

Ran unit tests.