git plugin: Add `gpoat` alias

plugins/git/git.plugin.zsh

@@ -38,6 +38,7 @@ alias gm='git merge'
 compdef _git gm=git-merge
 alias grh='git reset HEAD'
 alias grhh='git reset HEAD --hard'
+alias gpoat='git push origin --all && git push origin --tags'
 
 # Git and svn mix
 alias git-svn-dcommit-push='git svn dcommit && git push github master:svntrunk'