[MERGE] Add credits command and --show-class option

[John Arbash Meinel]

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Jelmer Vernooij wrote:
| Hi John,
|
| Attached is a patch for the stats plugin that makes it do basic
| analysis of the sort of commits that people have done. It's not very
| accurate yet, but it's a good start.
|
| It adds a credits command and a --show-class option to the stats
| command. E.g. for bzr-stats itself:
|
| ganieda:~/bzr-gtk/credits% bzr stats --show-class ~/bzr-stats/trunk
| getting ancestry
| getting revisions
|   13 John Arbash Meinel <john at arbash-meinel.com>
|      Contributions:
|         6% Unknown
|        94% code
|   12 Jelmer Vernooij <jelmer at samba.org>
|      Contributions:
|       100% code
|    1 Wesley J. Landaker <wjlanda at sandia.gov>
|      Contributions:
|       100% code
|
| ganieda:~/bzr-gtk/credits% bzr credits ~/bzr-stats/trunk
| Code:
| Jelmer Vernooij <jelmer at samba.org>
| John Arbash Meinel <john at arbash-meinel.com>
| Wesley J. Landaker <wjlanda at sandia.gov>
|
| Cheers,
|
| Jelmer
|

I honestly barely use 'bzr-stats' anymore, so if you would like to merge
this in, feel free.

John
=:->
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