to get around the verify error on jdk8u20 for ratpack-hystrix:test

see issue 450
Merge remote-tracking branch 'upstream/master'
update the test to expect JSON
changed the default result from string to JSON
clean up
clean up
undo the noverify
reverted to repo version
switching to using context.byContent, and also now using
content.getReponse().send to avoid lookup as per requested
undo the changes of paramers to final, I don't know the codebase
enough yet to be making this change
disable caching
Make publishers transformable.
Add some extra type info to stop idea complaining.
Provide method for converting a Publisher to a Promise.

Closes #488.
Minor docs.
Fix exec harness use with promise that returns null.
Avoid interim list.
Bind all execution segments to the same thread.

Closes #489.
Some Javadoc for HttpUrlBuilder.
updating references from JDK7 to JDK8