Create new templates for HTML output

[ajbrown]

This plugin uses Handlebars templates processed by Handlebars.java to generate HTML from RAML. The templates currently being used were lifted from raml2html, and adapted to match the model generated by the java-raml-processor.

The raml2html templates are only intended to be a proof of concept. We need to come up with our own design that works well with the java RAML model. Lets make it look clean, and be interactive where appropriate (example outputs, schemas, etc).