Add maven support
Merge branch 'master' of https://github.com/ChatSystem-INSA/ChatSystem
Add command class
Add ChatNI and UDP/TCP Listeners
Add UDPSocket
Add TCPSocket
Add invoker
Add Jackson and abstracFactory
Merge remote-tracking branch 'origin/master'
Change HelloParser to MessageParser
Change ChatNI to Singleton
Change name and delete ChatNI singleton