Add compatibility with videojs 4.6

[triwav]

Updating to version 4.6 causes an issue when you try to resume playback locally in Chrome. The issue is in
vjs.ChromeCastComponent.prototype.onStopAppSuccess. I think the issue is this gets run:
this.player_.src(this.player_.options_['sources']);
and in 4.6 the player now resets when you change the source
videojs/video.js#1124

The below code solves this but is not the correct way to do it. The key here is running load() to get it to reload the file locally.

// Fix for 4.6 not working correctly otherwise
this.player_.load();

var context = this;
setTimeout(function(){
if (context.apiMedia.playerState == "IDLE") {
    context.player_.currentTime(0);
    context.player_.onPause();
} else {

    if (!this.paused) {
        context.player_.play();
    }
    context.player_.currentTime(context.currentMediaTime);
}
this.apiMedia = null;
},500);

[triwav]

This appears the to be the cause of the issue:
videojs/video.js#1389

Implementing the isready = false solves this issue.