Add support for all Cloudinary options to the CloudinaryImage(s) field types

[JedWatson]

We should allow all options that the Cloudinary API supports from the CloudinaryImage(s) field type options, e.g. folder, use_filename, etc.

Full list here: http://cloudinary.com/documentation/node_image_upload

[grabbou]

I am quite up to date with Cloudinary thanks to using it in my current project. Going to review that this week.

[bringking]

This feature would be awesome, is there any status on this? Any way we can help?

[jeffreypriebe]

I believe folders and use_filename both work currently.

[danielmahon]

folders using cloudinary prefix does not work, I just pushed a fix, basically just copies what CloudinaryImage (singular) was doing