at last polling update
Active pushing of events, device change on load and unload. Added Refresher vaadin widget compiled with maven
Merge branch 'development' of ssh://opensource-stash.infn.it:7999/chaos/chaosframework into development
fixe left over import that cause compilation error probably cause on issue CHAOS-PREM-WP3
first implementation and a little bit tested of the synchronous reply on getLastData method in the Device Channel

Signed-off-by: Claudio Bisegni <Claudio.Bisegni@lnf.infn.it>
fix the synchronous answer on directio

Signed-off-by: Claudio Bisegni <Claudio.Bisegni@lnf.infn.it>