Set author and remove review when a branch is merged

[adiroiban]

As commit messages should be in the format

Merge <branch name>: Brief description

Author: <comma_separated_names>
Reviewer: <comma_separated_names>
Fixes: #<ticket number>

we should be able to extract the author from commit message.

I assume that we can change the doc to state that main author should be listed first.

I assume that I will need to work on this

https://github.com/twisted-infra/trac-config/blob/master/trac-post-commit-hook

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Is there a staging trac/svn instance where we can test this?

For my project I have a staging trac instance so I can use it during development and testing and will write unit tests

[adiroiban]

I will wait for #20 be fixed before continuing to work on this as we might use a different code for the commit hook

[adiroiban]

twisted-infra/braid#124