Add User.events.presence property for storing the m.presence event for a user.

lib/models/user.js

@@ -16,6 +16,8 @@
  * @prop {string} avatarUrl The 'avatar_url' of the user if known.
  * @prop {string} presence The presence enum if known.
  * @prop {Number} lastActiveAgo The last time the user performed some action in ms.
+ * @prop {Object} events The events describing this user.
+ * @prop {MatrixEvent} events.presence The m.presence event for this user.
  */
 function User(userId) {
     this.userId = userId;
@@ -23,6 +25,10 @@ function User(userId) {
     this.displayName = userId;
     this.avatarUrl = null;
     this.lastActiveAgo = 0;
+    this.events = {
+        presence: null,
+        profile: null
+    };
 }
 utils.inherits(User, EventEmitter);
 
@@ -39,6 +45,8 @@ User.prototype.setPresenceEvent = function(event) {
     if (event.getType() !== "m.presence") {
         return;
     }
+    this.events.presence = event;
+
     var eventsToFire = [];
     if (event.getContent().presence !== this.presence) {
         eventsToFire.push("User.presence");