Applied a patch from http://www.emacswiki.org/emacs/psvn.el.patch

This patch is necessary to address ".svn" directory structure change on Subversion 1.7 or later.
Workaround for a problem of white spaces on author name

This modification provides another workaround to address author names including white spaces instead of registering them to "svn-user-names-including-blanks" respectively, by automatically detecting white spaces on author name columns.

It isn't a complete solution for the problem, but would work well for most cases.