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).

The cookbook tests well, and converges properly locally using Vagrant, though there are some caveats regarding the data bags. Again, see fee65ac for details.

Let me know if you have any questions!