Add ability to add RaveJS to Spring Boot projects.

1. Bare bones, i.e. no pre-loaded modules
1. Supports both Gradle and Maven by creating a build step that will install the modules during the build phase.
1. Underneath src/main/resources/static, it creates:

* app/main.js - main entry point to start writing code. Has some handy comments for new devs
* package.json - npm-based configuration file including coordinates to install RaveJS
* boot.js - only item to pull into templates using a <script> tag. Details found in main.js

This sets the tone for automatically creating demo apps using modern, quality JavaScript tactics while also utilizing RaveJS, Pivotal's zero configuration JS loader.