added propagation of few errors

JitsiConference.js

     conference.room.addListener(XMPPEvents.BRIDGE_DOWN, function () {
         conference.eventEmitter.emit(JitsiConferenceEvents.CONFERENCE_FAILED, JitsiConferenceErrors.VIDEOBRIDGE_NOT_AVAILABLE);
     });
+    conference.room.addListener(XMPPEvents.RESERVATION_ERROR, function (code, msg) {
+        conference.eventEmitter.emit(JitsiConferenceEvents.CONFERENCE_FAILED, JitsiConferenceErrors.RESERVATION_ERROR, code, msg);
+    });
+    conference.room.addListener(XMPPEvents.GRACEFUL_SHUTDOWN, function () {
+        conference.eventEmitter.emit(JitsiConferenceEvents.CONFERENCE_FAILED, JitsiConferenceErrors.GRACEFUL_SHUTDOWN);
+    });
+    conference.room.addListener(XMPPEvents.JINGLE_FATAL_ERROR, function () {
+        conference.eventEmitter.emit(JitsiConferenceEvents.CONFERENCE_FAILED, JitsiConferenceErrors.JINGLE_FATAL_ERROR);
+    });
+    conference.room.addListener(XMPPEvents.MUC_DESTROYED, function (reason) {
+        conference.eventEmitter.emit(JitsiConferenceEvents.CONFERENCE_FAILED, JitsiConferenceErrors.CONFERENCE_DESTROYED, reason);
+    });
+    conference.room.addListener(XMPPEvents.CHAT_ERROR_RECEIVED, function (err, msg) {
+        conference.eventEmitter.emit(JitsiConferenceEvents.CONFERENCE_FAILED, JitsiConferenceErrors.CHAT_ERROR, err, msg);
+    });
 //    FIXME
 //    conference.room.addListener(XMPPEvents.MUC_JOINED, function () {
 //        conference.eventEmitter.emit(JitsiConferenceEvents.CONFERENCE_LEFT);

JitsiConferenceErrors.js

     /**
      * Indicates that there is no available videobridge.
      */
-    VIDEOBRIDGE_NOT_AVAILABLE: "conference.videobridgeNotAvailable"
+    VIDEOBRIDGE_NOT_AVAILABLE: "conference.videobridgeNotAvailable",
+    /**
+     * Indicates that reservation system returned error.
+     */
+    RESERVATION_ERROR: "conference.reservationError",
+    /**
+     * Indicates that graceful shutdown happened.
+     */
+    GRACEFUL_SHUTDOWN: "conference.gracefulShutdown",
+    /**
+     * Indicates that jingle fatal error happened.
+     */
+    JINGLE_FATAL_ERROR: "conference.jingleFatalError",
+    /**
+     * Indicates that conference has been destroyed.
+     */
+    CONFERENCE_DESTROYED: "conference.destroyed",
+    /**
+     * Indicates that chat error occured.
+     */
+    CHAT_ERROR: "conference.chatError"
     /**
      * Many more errors TBD here.
      */

doc/API.md

         - PASSWORD_REQUIRED - that error can be passed when the connection to the conference failed. You should try to join the conference with password.
         - PASSWORD_NOT_SUPPORTED - indicates that conference cannot be locked
         - VIDEOBRIDGE_NOT_AVAILABLE - video bridge issues.
+        - RESERVATION_ERROR - error in reservation system
+        - GRACEFUL_SHUTDOWN - graceful shutdown
+        - JINGLE_FATAL_ERROR - error in jingle
+        - CONFERENCE_DESTROYED - conference has been destroyed
+        - CHAT_ERROR - chat error happened
     2. connection
         - PASSWORD_REQUIRED - passed when the connection to the server failed. You should try to authenticate with password.
         - CONNECTION_ERROR - indicates connection failures.