Check for toJson() in option if Handler or AsyncResultHandler

Signed-off-by: Joern Bernhardt <jb@campudus.com>
Add tests for invalid Handler and AsyncResult Handler with Options

Signed-off-by: Joern Bernhardt <jb@campudus.com>
Remove unnecessary option test class

Signed-off-by: Joern Bernhardt <jb@campudus.com>
Merge pull request #17 from vert-x3/support-proxy-options

Check for toJson() in option if Handler or AsyncResultHandler