We originally used 'en_US.UTF-8' as the locale for executing subprocesses.

After a bug report from someone who didn't have the en_US locale on their

system, we changed it to 'C', but that broke non-ASCII commit messages with

SVN. The third try, 'C.UTF-8' isn't well supported (yet). Overall, it seems

like our original choice, 'en_US.UTF-8' is the best (least worst) of these.
Ideally this would be override-able in the config file, but the execute()

method doesn't yet have the plumbing to do this. I've added a comment to this

effect.

Ran unit tests.