Add multiple bundles.
  
    $ echo "$PLUGIN_DIR
  $PLUGIN_DIR2" | antigen-bundles
    Cloning into '.+?'\.\.\. (re)
    done.
    Cloning into '.+?'\.\.\. (re)
    done.
  
  Check if they are both applied.
  
    $ hehe
    hehe
    $ hehe2
    hehe2