add operator==, remoteIP and remotePort to EthernetClient
add localPort to EthernetClient, simplify operator==
add some lines of comment to ChatServer.ino, remove redundant assignment of Client-instance
revert Chatserver example, create new AdvancedChatServer based on it
apply AdvancedChatServer.ino changes to renamed ChatServer.ino
remove all Changes besides operator==
update AdvancedChatServer.ino, add operator!=
Merge pull request #1700 from ntruchsess/ethernetclient2

Enhancement: add operator==, localPort, remoteIP and remotePort to EthernetClient