ratpack primer as a getting started guide
Merge pull request #137 from tomaslin/master

Manual : Getting started guide
Fix heading detection in markdown2book.
Don't implicitly add charset content type params to non text content types.
Cosmetic changes.
Convenience methods for sending input streams (closes #88).
Adding Java convenience methods for adding GET handlers to a chain
Merge branch 'master' of https://github.com/rhart/ratpack
Adding Java convenience methods for adding POST handlers to a chain