Turn "compile-time constant" into compile-time constant
Tone down logging in SelectionHandler
Link to old migration guides instead of embedding, see #2774

* Otherwise the embedded old migration guide might have wrong
  version variable replacements (scala, config lib) when changed
  versions are changed in master
 #3077 - Deprecating ActorRef.isTerminated
Merge pull request #1290 from akka/wip-3077-deprecate-isTerminated-√

 #3077 - Deprecating ActorRef.isTerminated
rename UdpFF->Udp and the other UdpConnected, see #3058
Merge pull request #1273 from akka/wip-3058-UDP-naming-∂π

rename UdpFF->Udp and the other UdpConnected, see #3058
Associate Tcp.CloseCommands with their respective confirmation events
Make use of new command.failureMessage
Clean up imports
TcpOutgoingConnection: Respond with CommandFailed rather than ErrorClosed on failed connect

Before, a Tcp.ErrorClosed event is generated when a connection attempt fails. For symmetry with the Tcp.Bind case and general usability of the API a Tcp.CommandFailed(connect) is the better choice.
Small simplification in TcpConnection
Merge pull request #1281 from spray/master

Smaller improvements to TCP side of new akka-io implementation
Merge pull request #1293 from akka/wip-2774-old-migration-guide-patriknw

Link to old migration guides instead of embedding, see #2774
Fix ScalaDoc for ExtensionKey (Scala API) (closes #3197)
Changed to Netty 3.6.3.Final, see #3190
Merge pull request #1297 from akka/wip-3190-netty-3.6.3-patriknw

Changed to Netty 3.6.3.Final, see #3190
Change to Netty 3.6.4.Final, see #3190
Merge pull request #1300 from akka/wip-3190-netty-3.6.4-patriknw

Change to Netty 3.6.4.Final, see #3190
Adding more tests to MailboxSpec so that we know they follow the contract ;)