Allow Usernames in Subversion Repo URL

Review Request #337 — Created April 4, 2008 and submitted — Latest diff uploaded

Review Board SVN (deprecated)
We use svn served over ssh, so most users have working copies checked out using a URL like svn+ssh://durin42@host... which means that post-review was passing the wrong repository to the ReviewBoard server. This small patch fixes that problem for us.
I've been posting reviews with this for over a week, and some other users have been using it too.