I should not have merged this here.

plugins/git-svn/.gitignore

-git-svn-clone-externals

plugins/git-svn/git-svn.plugin.zsh

-
-if ! [ -d "$ZSH/plugins/git-svn/git-svn-clone-externals" ] ;then
-    git clone https://github.com/andrep/git-svn-clone-externals.git
-fi
-export PATH="$ZSH/plugins/git-svn/git-svn-clone-externals:$PATH"
-
-function git_svn_update {
-    (cd "$ZSH/plugins/git-svn/git-svn-clone-externals" && \
-        git pull origin master)
-}