2.5.2 version publish

1. Added primary param to fix priority of html5 and flash player.
2. Added draggable param in HTML5 player.
3. Fixed the progress bar display problem on bootstrap framework.
4. Fixed the flash player can not play relative video path.
5. Fixes some mini bugs.

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1、增加primary参数，用于确定html5与flash播放的优先级。
2、HTML5模块加入draggable参数。
3、修复了在bootstrap框架中弹窗进度条错误的问题。
4、修复了Flash模块无法播放相对路径视频地址的问题。
5、修复了一此小问题。