Factory suggestion

[roybekhuis]

First of all thanks for all your effort in writing this angular wrapper!
There are two things that might be helpfull to implement in my opinion.
First change scope.$apply in the main directive to scope.$applyAsync as it gives Error: [$rootScope:inprog] $apply already in progress

I didn't see a play/pause function in the factory. As I understand you use initPlayTrack for that function.

I suggest to implement isResume to playTrack like this

ngSoundManager.factory( ...

        playTrack: function(trackId,isResume) {
            this.initPlayTrack(trackId,isResume);
        }

thanks again!