Create SessionFuture and SessionFutureListener interfaces and basic
implementations
Merge branch 'master' into session-future
Merge branch 'master' into session-future
Refactoring: Extract AbstractPollingSession
Merge branch 'master' into session-future
Make refactoring of sessions
Refactor polling session and move channel checks into abstract session
Minor
Implement session future support on send method for socket-based
transports
Implement session future on polling session
Update Changes.txt
Merge pull request #4 from socketIo4Netty/session-future

Return future on `ISession` send operation