Merge branch 'rename-mute-to-toggle'

doc/api.md

 ```
 api.executeCommand('displayName', ['New Nickname']);
 ```
-* **muteAudio** - mutes / unmutes the audio for the local participant. No arguments are required.
+* **toggleAudio** - mutes / unmutes the audio for the local participant. No arguments are required.
 ```
-api.executeCommand('muteAudio', [])
+api.executeCommand('toggleAudio', [])
 ```
-* **muteVideo** - mutes / unmutes the video for the local participant. No arguments are required.
+* **toggleVideo** - mutes / unmutes the video for the local participant. No arguments are required.
 ```
-api.executeCommand('muteVideo', [])
+api.executeCommand('toggleVideo', [])
 ```
 * **toggleFilmStrip** - hides / shows the film strip. No arguments are required.
 ```
 commands.
 
 ```
-api.executeCommands({displayName: ['nickname'], muteAudio: []});
+api.executeCommands({displayName: ['nickname'], toggleAudio: []});
 ```
 
 You can add event listeners to the embedded Jitsi Meet using ```addEventListener``` method.

external_api.js

      * Executes command. The available commands are:
      * displayName - sets the display name of the local participant to the value
      * passed in the arguments array.
-     * muteAudio - mutes / unmutes audio with no arguments
-     * muteVideo - mutes / unmutes video with no arguments
+     * toggleAudio - mutes / unmutes audio with no arguments
+     * toggleVideo - mutes / unmutes video with no arguments
      * filmStrip - hides / shows the film strip with no arguments
      * If the command doesn't require any arguments the parameter should be set
      * to empty array or it may be omitted.
      * Executes commands. The available commands are:
      * displayName - sets the display name of the local participant to the value
      * passed in the arguments array.
-     * muteAudio - mutes / unmutes audio with no arguments
-     * muteVideo - mutes / unmutes video with no arguments
+     * toggleAudio - mutes / unmutes audio with no arguments
+     * toggleVideo - mutes / unmutes video with no arguments
      * filmStrip - hides / shows the film strip with no arguments
      * @param object the object with commands to be executed. The keys of the
      * object are the commands that will be executed and the values are the

modules/API/API.js

  * List of the available commands.
  * @type {{
  *              displayName: inputDisplayNameHandler,
- *              muteAudio: toggleAudio,
- *              muteVideo: toggleVideo,
+ *              toggleAudio: toggleAudio,
+ *              toggleVideo: toggleVideo,
  *              toggleFilmStrip: toggleFilmStrip,
  *              toggleChat: toggleChat,
  *              toggleContactList: toggleContactList
 function initCommands() {
     commands = {
         displayName: APP.UI.inputDisplayNameHandler,
-        muteAudio: APP.UI.toggleAudio,
-        muteVideo: APP.UI.toggleVideo,
+        toggleAudio: APP.UI.toggleAudio,
+        toggleVideo: APP.UI.toggleVideo,
         toggleFilmStrip: APP.UI.toggleFilmStrip,
         toggleChat: APP.UI.toggleChat,
         toggleContactList: APP.UI.toggleContactList