Js.videojs

* saxena-gaurav updated swf to 4.7.2 to fix flash of previous video frame ([view](https://github.com/videojs/video.js/pull/2300))
* gkatsev updated the vtt.js version to fix JSON issues ([view](https://github.com/videojs/video.js/pull/2327))
* dmlap fixed an error caused by calling vjs_getProperty on the swf too early ([view](https://github.com/videojs/video.js/pull/2289))

* dmlap update to video-js-swf 4.7.1 ([view](https://github.com/videojs/video.js/pull/2280))
* imbcmdth src() should not return blob URLs with MSE source handlers ([view](https://github.com/videojs/video.js/pull/2271))

* imbcmdth updated currentSrc to return src instead of blob urls in html5 tech. Fixes 2232 ([view](https://github.com/videojs/video.js/pull/2232))
* imbcmdth fixed async currentSrc behavior ([view](https://github.com/videojs/video.js/pull/2256))

* dmlap add the seekable property ([view](https://github.com/videojs/video.js/pull/2207))
* dmlap fix seekable export ([view](https://github.com/videojs/video.js/pull/2227))

* tjenkinson Added background-color to vjs-poster to remove transparent borders around scaled poster image ([view](https://github.com/videojs/video.js/pull/2138))
* bc-bbay fixed a bug where the player would try to autoplay when there was no source ([view](https://github.com/videojs/video.js/pull/2127))
* bc-bbay update time display on loadedmetadata ([view](https://github.com/videojs/video.js/pull/2151))
* dmlap update swf to 4.7 to pick up preload fix ([view](https://github.com/videojs/video.js/pull/2170))

* saxena-gaurav fixed a bug from disposing after changing techs ([view](https://github.com/videojs/video.js/pull/2125))