Conditionally install npm tools (#1641)

env-example

@@ -80,6 +80,9 @@ WORKSPACE_NODE_VERSION=stable
 WORKSPACE_NPM_REGISTRY=
 WORKSPACE_INSTALL_YARN=true
 WORKSPACE_YARN_VERSION=latest
+WORKSPACE_INSTALL_NPM_GULP=true
+WORKSPACE_INSTALL_NPM_BOWER=true
+WORKSPACE_INSTALL_NPM_VUE_CLI=true
 WORKSPACE_INSTALL_PHPREDIS=true
 WORKSPACE_INSTALL_WORKSPACE_SSH=false
 WORKSPACE_INSTALL_SUBVERSION=false