Merge in current twilson63/s3fs-recipe, refactor to use Berkshelf

I'll understand if you reject this pull request, but for our needs, we use Berkshelf, and the structure of this cookbook wasn't working.

So, I merged in the latest from [twilson63/s3fs-recipe](https://github.com/twilson63/s3fs-recipe), resolved in favor of S3FS-C (see 39bafdc), then reorganized & refactored into a Berkshelf-style cookbook (see fee65ac).

Let me know if you have any questions!