localTracks[i].stop();
As localTracks doesn't have stop function , coz of this line getting error and user was not able to left the room or unload 

So changed it to :
localTracks[i].dispose();

* feat(recording): frontend logic can support live streaming and recording

Instead of either live streaming or recording, now both can live together.
The changes to facilitate such include the following:
- Remove the old recording.js module which allowed one recording at a time.
- Remove events for live stream url changes as the url is now part of a
  sesssion and not fired independently.
- Availability of sipgw and recording are gone. Instead sessions have a
  failure reason. For sipgw sessions, store that failure and emit it to
  listeners.
- Create a new recordingManager singleton that can start/stop sessions
  and handle updating known state of those sessions. Known state is
  emitted through one event.
- Create a JibriSession model to encapsulate state of a session.

* update comments, use map to store sessions

* always pass in focusmucjid

* try to fix jibrisession docs and remove default null

After running `npm install` I end up with a minified library for lib-jitsi-meet. I had to adjust the name to get the example to run

In order to include browser capabilities in RTCBrowserType I needed to
refactor RTCBrowserType.

Added descriptions for user identifying information in JWT tokens
Added better descriptions of prosody configuration settings when accepting JWT tokens

Also, updatee the documentation section on connection errors.

* Uses optional statsId to report to callstats and push it to presence.

The feature is behind a flag which is disabled by default.

* Renames statsId to statsID.

* Fixes doc.

This is performed by stripping all traces of H.264 from the local SDP before
passing it to `setLocalDescription`.

ESLint 4.8.0 discovers a lot of error related to formatting. While I
tried to fix as many of them as possible, a portion of them actually go
against our coding style. In such a case, I've disabled the indent rule
which effectively leaves it as it was before ESLint 4.8.0.

Instead of failing with an error if another operation is in progress, which is
impossible to know as a user, chain them using the primises API.

* feat: add 'disableDesktopSharing' option

* ref(ScreenObtainer): simplify init

Some browsers may not support data channels (hi there, Edge!) and sometimes it
may not be desirable for other reasons.

* Get local user ID

How to get the id Participate local.

* Correction of the sequence of numbers

Token is passed as parameter when creating JitsiConnection and we no longer use it from the options passed to the connection.

Ignores start audio/video muted requests received by jicofo.

Make sure there are options to set the extension ID and an enabled flag for
both Chrome and Firefox.

Removed checking for deprecated configuration options: desktopSharing,
chromeExtensionId and minChromeExtVersion.