Make thumbnail size responsive (#15)
Make thumbnail size responsive (#15)

- single thumbs are truly scaled
- sprite thumbs are _cropped_ centered - consider optional 3 sprites:
  normal, small, tiny and loading depending on state class

Can be turned off by configuring thumbnails.responsive = false.

Also ensure that thumbnails.lazyload and thumbnails.responsive default
config values survive minification of site scripts.

flowplayer/flowplayer-thumbnails,flowplayer/flowplayer-thumbnails,blacktrash/flowplayer-thumbnails,blacktrash/flowplayer-thumbnails,nnarhinen/flowplayer-thumbnails,nnarhinen/flowplayer-thumbnails