Merge git://bogomips.org/git-svn

By Jonathan Nieder
via Eric Wong
* git://bogomips.org/git-svn:
  git-svn: make Git::SVN::Fetcher a separate file
  git-svn: rename SVN::Git::* packages to Git::SVN::*
  git-svn: move Git::SVN::Prompt into its own file

Author: gitster