fix copy-packages in zsh (without breaking sh and bash)

nvm.sh

@@ -486,8 +486,8 @@ nvm() {
         fi
         VERSION=`nvm_version $2`
         ROOT=`nvm use $VERSION && npm -g root`
-        INSTALLS=`nvm use $VERSION > /dev/null && npm -g -p ll | \grep "$ROOT\/[^/]\+$" | cut -d '/' -f 8 | cut -d ":" -f 2 | \grep -v npm | tr "\n" " "`
-        npm install -g $INSTALLS
+        INSTALLS=( `nvm use $VERSION > /dev/null && npm -g -p ll | \grep "$ROOT\/[^/]\+$" | cut -d '/' -f 8 | cut -d ":" -f 2 | \grep -v npm | tr "\n" " "` )
+        npm install -g ${INSTALLS[@]}
     ;;
     "clear-cache" )
         rm -f $NVM_DIR/v* 2>/dev/null