#116 Fluent API for InvocationBuilder
#116 updated testing chapter for the fluent API
#38 style guidelines for markdown in the manual
Suppress warnings.
Remove a bunch of overloads in Handlers, pushing the composition responsibility to Chain.
Merge pull request #158 from rhart/master

Globally configured index files (closes #148)
Move the launchconfig to index files responsibility out of NettyHandlerAdapter.
Move the index file stuff to launch config proper, and don't bother making it contextual.
Make it possible to set the index files value in ratpack.properties.
Collapse the responder mechanism into Handler, as they are just the same thing.
Javadoc.
Javadoc improvements.