Merge pull request #156 from rhart/master

Create convenience methods for PUT and DELETE (closes #154)
Don't use ClosureBackedHandler directly.
Upgrade to Netty 4.0.8
Use a singleton object mapper.
fixed typo in the manual: template file should be saved under 'templates'
Docs and polishing on Jackson module (closes #134).
More docs for Jackson module.
added kmarquardsen to Contributors list
Link to Jackson API docs.
Support pretty printing in the Jackson module.
s/mapper/writer
#116 allow for using InvocationBuilder / Invocation in a given/when/then style test
#116 changed InvocationBuilderSpec to use non-static form of invoke
Factor the test client stuff out to a Java mixin.
Copy the response buffer for the invocation object.
Make the test buffers unreleasable.
Lock the test response buffer later.
Rationalise the test support stuff, making sure everything is implemented in Java.

We no longer ship Spock spec's in groovy-test.
Fix visibility violation.
Merge pull request #157 from kmarquardsen/ratpack-manual

fixed typo in the manual: template file should be saved under 'templates...