reset content each time we call video.watermark

[Cylix]

Hi,

I'm currently using your plugin with the videoJS-playLists plugin and I sometimes need to update the watermark.

However, each time we call video.watermark({ ... }), it does not clean the previous content but add the new content over the previous one.

With this commit we can do:

// at first
video.watermark({
  file: 'http://www.videojs.com/img/logo.png',
  xpos: 50,
  ypos: 50,
  xrepeat: 0,
  opacity: 0.5
  });

// then later
video.watermark({
  file: 'http://www.videojs.com/img/an_other_logo.png',
  xpos: 50,
  ypos: 50,
  xrepeat: 0,
  opacity: 0.5
  });

This will remove the first content and replace it with the new one.

[xbgmsharp]

Great. Coud you make the div className an parameter?

[Cylix]

Yes of course, I'll do that.

[Cylix]

Done, className can now be passed as parameter. Default value is still vjs-watermark.

[xbgmsharp]

Cool thanks for your commit