Binary upgrade, fixes #85

This PR contains couple of features:

* Simple support for live binary upgrades
* Remove misleading connwatcher that does not work properly
* Track connections to sockets and emit stats 
a few more typo fixes:

    // server contains all that is necessary to run the HTTP(s) server. server does not work on its own,
    // it heavily depends on MuxServer and acts as its internal data structure.