Implement Dock icon status for Subversion actions

Sometimes you do a lot of changes and your commit is gonna take awhile. Like say, for a whole bunch of files, maybe a large media file has been changed, or sometimes you're committing an entire site for the first time or you've just done a complete redesign.

I'd love to see a status icon implemented for Subversion actions, similar to the status icons that are on Coda's dock icon when uploading or downloading files from a remote server.