Add nodejs frontend tools for drupalvm integration

[bhasselbeck]

When building out on the virtual machine, some necessary plugins are not included for phantomJS or other front-end engine building tools such as node, npm, bower, and gulp. We should include these by default.

https://github.com/acquia/blt/blob/8.x/scripts/drupal-vm/config.yml

We could simply add the following configuration:

# This is required for front-end building tools.
nodejs_version: "0.12"
nodejs_npm_global_packages:
  - name: bower
  - name: gulp-cli
nodejs_install_npm_user: "{{ drupalvm_user }}"
npm_config_prefix: "/home/{{ drupalvm_user }}/.npm-global"
installed_extras:
  - nodejs

extra_packages:
  # This is required for PhantomJS Installer.
  - php-bz2
  - php-bcmath

[grasmash]

Merged in #325