mover to next major release of oncrpc4j with bugfixes and improvements:

Changelog for oncrpc4j-2.3.3..oncrpc4j-2.4.0
    * [166a3c7] ignore IDEA working directory
    * [6ac5a4b] add graceful stop() to OncRpcSvc
    * [5cd211f] portmap: add OncRpcEmbeddedPortmap#shutdown()
    * [90fbde1] oncrpc: client must handle disconnects
    * [9d4bcb9] oncrpc: craete EOFexception in ReplyQueue#isConnectionAlive()
    * [8a418c4] docs: point to latest stable release in README
    * [648da4a] oncrpcsvc: fix shutdown of spring-IoC
    * [ea79b42] oncrpcsvc: fix service registration on dual stack servers
    * [fcb8e7d] oncrpcsvc: fix logging of registration at rpcbind
    * [f3fff20] src: require java7
    * [a3cc104] src: use java7 if possible
    * [82474f7] create generated source under package path, allow absoulte path for x-file, ignore intelliJ and maven files
    * [ac3ed7b] src: remove from mercurial migration artifacts
    * [6419a61] rpc: fix SimpleRpcClient
    * [1b7e39c] rpc: implement async client
    * [ee51e06] rpc: expose client's asynchronous behaviour
    * [f522af9] rpc: use Future#get instead of CountdownLaunch for sync calls
    * [316e913] rpc: return Future with RPC call reply type

Acked-by: Karsten Schwank
Acked-by: Paul Millar
Target: master
Require-book: no
Require-notes: no