Add proposed interface for http headers
Upgrade to hazelcast 2.5.1 https://github.com/vert-x/vert.x/issues/548
improved logging
https://github.com/vert-x/vert.x/issues/564
https://github.com/vert-x/vert.x/issues/552
changes to get Java examples working again
Changes for upcomming netty 4.0.0.CR2
[#577] Remove isOpen() check on write as it may return false even the connection attempt was complete.
suppressed annoying Netty info message
Merge upstream/master

Signed-off-by: Julien <jlehuraux@chyro.fr>