[MERGE] show_log with get_revisions

[Aaron Bentley]

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Hi all,

I've been working on improving performance of the log command, because
this is one of the first things a new user will experience.  This bundle
adds Repository.get_revisions, and teaches show_log to use it.

This produces a 13% speedup in my tests, and should also make further
optimization possible.

Aaron
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