Add a new stream-unsubscribed event (lynckia#1343)

Fix memory corruption with latest nicer (lynckia#1339)

Go back to pre-es6 version of the db.eval function (lynckia#1337)

Use of new version of nICEr (it allows more concurrent connections) (l…

…ynckia#1327)

Use forEach in the Map instead of Map.values() (lynckia#1316)

Use forEach in the Map instead of Map.values() (lynckia#1316)

Fix SDP negotiation when a stream is audio only (lynckia#1307)

Fix concurrency issues in video bitrate stats access (lynckia#1305)

Fix concurrency issues in video bitrate stats access (lynckia#1305)

Cleaned up sdp management (lynckia#1303)