Print the `npm` version when using `nvm exec` or `nvm run`.

nvm.sh

@@ -1713,11 +1713,11 @@ nvm() {
         fi
         EXIT_CODE="$?"
       elif [ "$NVM_IOJS" = true ]; then
-        echo "Running io.js $(nvm_strip_iojs_prefix "$VERSION")"
+        echo "Running io.js $(nvm_strip_iojs_prefix "$VERSION")$(nvm_print_npm_version)"
         OUTPUT="$(nvm use "$VERSION" >/dev/null && iojs $ARGS)"
         EXIT_CODE="$?"
       else
-        echo "Running node $VERSION"
+        echo "Running node $VERSION$(nvm_print_npm_version)"
         OUTPUT="$(nvm use "$VERSION" >/dev/null && node $ARGS)"
         EXIT_CODE="$?"
       fi
@@ -1751,7 +1751,7 @@ nvm() {
         return $EXIT_CODE
       fi
 
-      echo "Running node $VERSION"
+      echo "Running node $VERSION$(nvm_print_npm_version)"
       NODE_VERSION="$VERSION" $NVM_DIR/nvm-exec "$@"
     ;;
     "ls" | "list" )