pumping hawk version.
release
rolling master version.
Set content-type on input.
Release.
Rolling version.
Empty body must be passed as empty string, exclude JSON case
Merge pull request #490 from Olegas/master

Empty response body (3-rd argument) must be passed to callback as an empty string
Moving response emit above setHeaders on destination streams
Merge pull request #498 from kenperkins/responseEmitChange

Moving response emit above setHeaders on destination streams
Cleanup whitespace.
Merge remote-tracking branch 'upstream/master'