clean sessions by request
* Backend connection exclusive by RemoteUser;
* SafeJsonObject removed;
* Minor bug fix and refactor.
* ConnectionsCounter removed; Session counter migrated to Backend class; BackendSession refactor.
CounterWithEventBus implemented
Using CounterWithEventBus
Session Pool support
Rename Backend.startPool => Backend.startSessionPool
Package com.globo.galeb.criteria created
SafeLogger implemented
Merge new-entity
Renamed ICriterion.getResult => ICriterion.thenResult
BackendPool implemented