Merge pull request #431 from meh/rsync-plugin

Add rsync plugin.

plugins/rsync/rsync.plugin.zsh

+alias rsync-copy="rsync -av --progress -h"
+alias rsync-move="rsync -av --progress -h --remove-source-files"
+alias rsync-update="rsync -avu --progress -h"
+alias rsync-synchronize="rsync -avu --delete --progress -h"