Ignore Intellij files.
1. Allow the NreplServer to stop and start, with option to build the NreplServer without starting.
2. Register MBean for starting/stoping with JMX.
Refactor Start/Stop:
- use swap! instead of reset! in net.matluk.server.nrepl
- use value of the atom 'server' to serve isStarted
- allow to change the port
Merge branch 'stanislas-master'
added some integration tests
fixed the thread safety issue with swap! on starting/stopping the server.
improved some tests