Close videojsGH-614: added dispose event. fixes videojs#613.

src/js/component.js

@@ -45,6 +45,8 @@ vjs.Component = vjs.CoreObject.extend({
  * Dispose of the component and all child components.
  */
 vjs.Component.prototype.dispose = function(){
+  this.trigger('dispose');
+
   // Dispose all children.
   if (this.children_) {
     for (var i = this.children_.length - 1; i >= 0; i--) {

src/js/player.js

@@ -86,7 +86,9 @@ vjs.Player = vjs.Component.extend({
 vjs.Player.prototype.options_ = vjs.options;
 
 vjs.Player.prototype.dispose = function(){
-  // this.isReady_ = false;
+  this.trigger('dispose');
+  // prevent dispose from being called twice
+  this.off('dispose');
 
   // Kill reference to this player
   vjs.players[this.id_] = null;

test/unit/component.js

@@ -82,8 +82,12 @@ test('should dispose of component and children', function(){
   var data = vjs.getData(comp.el());
   var id = comp.el()[vjs.expando];
 
+  var hasDisposed = false;
+  comp.on('dispose', function(){ hasDisposed = true; });
+
   comp.dispose();
 
+  ok(hasDisposed, 'component fired dispose event');
   ok(!comp.children(), 'component children were deleted');
   ok(!comp.el(), 'component element was deleted');
   ok(!child.children(), 'child children were deleted');