Support re-joining after disconnect

[NerdyProjects]

On my mumble setup, all users are disconnected because of a server restart every night.

Currently, mumsi crashes with

terminate called after throwing an instance of 'boost::exception_detail::clone_impl<boost::exception_detail::error_info_injector<boost::system::system_error> >'
  what():  write: Broken pipe
Aborted (core dumped)

and I would like to see mumlib catching this error and giving some disconnect event or whatever.

[slomkowski]

In this case I'll wrap it with mumlib::MumlibException. See slomkowski/mumsi#5.

[slomkowski]

I've made some changes to support reconnection better. The best way to reconnect is to recreate object as shown in the loop in mumlib_example.cpp. I've ran into some issues, when I try to call disconnect and connect after Broken pipe error.

I think it's possible to implement reconnection in Mumsi in similar manner.