License headers.
Some minimal javadoc.
Merge branch 'master' into vertx

Conflicts:
	ratpack-core/src/main/groovy/org/ratpackframework/Request.groovy
	ratpack-core/src/main/groovy/org/ratpackframework/Response.groovy
	ratpack-core/src/main/groovy/org/ratpackframework/Routing.groovy
	ratpack-core/src/main/groovy/org/ratpackframework/app/internal/RatpackHandler.groovy