add gulp task for building and make it required by deploy
add gulp task for building and make it required by deploy

UoSMediaFrameworks/uos-media-playback-framework-legacy,Colum-SMA-Dev/MediaPlaybackFramework,Colum-SMA-Dev/MediaPlaybackFramework,UoSMediaFrameworks/uos-media-playback-framework-legacy,UoSMediaFrameworks/uos-media-playback-framework-legacy,Colum-SMA-Dev/MediaPlaybackFramework