Fix firefox sync, finally!

js/SoundManager.js

@@ -111,6 +111,8 @@ SoundManager.prototype.playSong = function(song, playBuild, callback) {
             if(callback)
                 callback();
             
+            // This fixes sync issues on Firefox and slow machines.
+            that.context.suspend().then(function() {
                 if(playBuild) {
                     // mobile webkit requires offset, even if 0
                     that.bufSource.start(0);
@@ -119,9 +121,9 @@ SoundManager.prototype.playSong = function(song, playBuild, callback) {
                     that.bufSource.start(0, that.loopStart);
                     that.startTime = that.context.currentTime;
                 }
-            // offset to after the build
-            //that.startTime = that.context.currentTime + that.loopStart;
+                that.context.resume();
                 that.playing = true;
+            });
         }
     });
 }