Merge branch 'uh/git-svn-serf-fix'

"git-svn" used with SVN 1.8.0 when talking over https:// connection dumped core due to a bug in the serf library that SVN uses. Work it around on our side, even though the SVN side is being fixed. * uh/git-svn-serf-fix: git-svn: fix termination issues for remote svn connections