Init request if not set in getRequest.
Support Ratpack.groovy as well as ratpack.groovy.

Primarily to workaround http://youtrack.jetbrains.com/issue/IDEA-116243
Redesign Groovy module public API to group all static imports to ratpack.groovy.Groovy class.
Missed file during previous commit.
Asset handler should pass through on not found file, not 404.
Capitalize to avoid IDEA bug
Merge pull request #181 from beckje01/requestLazyInit

Init request if null in getRequest.
Fix forum link.
Fix some links.
Some work on the front page.
Fix front page sample.
Change group to “io.ratpack”.
Don't wrap Javadoc comments.
Minor javadoc formatting.
Fix formatting.
Fix javadoc.
Configure our nullable annotation.
Improve the Jackson stuff.
Introduce a Groovy specific Context interface which allows Closure API specialisations.

Used this to implement a better blocking API for Groovy.
Rename the Groovy Context subclass to GroovyContext.