[TIMOB-18924] Ti.Media.AudioPlayer properties: progress and time appear to be same data, but used on different platforms

From https://github.com/appcelerator/titanium_mobile_windows/pull/244#discussion_r30416236 http://docs.appcelerator.com/platform/latest/#!/api/Titanium.Media.AudioPlayer-property-progress There's a progress property and a time property on Ti.media.AudioPlayer. progress is used on iOS, time is used on Android. They are both durations reported in milliseconds. I'm not sure what he difference is between them.