Misc updates

* Removed the halfclose event, https://github.com/sysapps/raw-sockets/issues/39.
* Changed message/onMessage to data/onData for TCP, https://github.com/sysapps/raw-sockets/issues/41.
* Nagle algorithm/TCP_NODELAY, https://github.com/sysapps/raw-sockets/issues/40.
* Description of "loopback" attribute, https://github.com/sysapps/raw-sockets/issues/38.
* Binding a socket to a local port when it is not specifically specified, https://github.com/sysapps/raw-sockets/issues/37.
* Minor corrections in simplified examples 1 and 2 submitted by Marcos.
* Added example use cases to the Introduction section, https://github.com/sysapps/raw-sockets/issues/14.
* Added reference to DOM.