Started blog post on ratpack templates
Wrote section on renering data in templates
Wrote section on composing templates
Minor rewording.
Aligned some wording with terms used in Ratpack's docs.
Beef up section on models and template basics.
Minor changes to render section.
Add note about new markup template renderer.
Merge pull request #1 from alkemist/ratpack-templates

Some additions.
Gave attribution to Luke Daley