Change parameters to CommitStats#initialize

CommitStats#initialize used to take `repositories` and `since`. I
changed it to to take `repositories_directory` and `days_ago` because
that was the only way I was calling it.

Change-Id: Id5d611b3f9d75a732895ad667405b7607a4e2c88
Reviewed-on: https://gerrit.causes.com/22010
Reviewed-by: Jimmy Kittiyachavalit <jimmy@causes.com>
Tested-by: Jimmy Kittiyachavalit <jimmy@causes.com>
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Change-Id: I33930d4ab8554a16a8773c9f7ee60d12c155794b
Reviewed-on: https://gerrit.causes.com/22011
Reviewed-by: Jimmy Kittiyachavalit <jimmy@causes.com>
Tested-by: Jimmy Kittiyachavalit <jimmy@causes.com>