Add support for Options in result handler for proxies

Signed-off-by: Joern Bernhardt <jb@campudus.com>
Add tests, update README.md and support Handler<@Option> as well

Signed-off-by: Joern Bernhardt <jb@campudus.com>
Add test methods for Handler<@Options>

Signed-off-by: Joern Bernhardt <jb@campudus.com>
Merge pull request #14 from vert-x3/support-proxy-options

Add support for Options in result handler for proxies