[PATCH] Brightcove field image formatter

Brightcove image formatter does not returns video thumbnail or poster from Brightcove API, instead of that returns default image. Current 7.x-6.x module does not apply the new Brightcove PHP API Wrapper methods such as $cms->getVideoImages(), getThumbnail(), getPoster()...

This patch needs more work, as noted in the code:

1) It would be good to cache thumbnails,
2) Missing support for image styles,

Caching is not a problem, but not sure what to do with image styles, in order to do that, remote images (thumbnails / posters), should be stored locally in order to handle appropriate image presets. Also, I'm not sure about the plans, UI / module design, you might not want this feature implemented?

Any review / comment / specification is welcome.