Associate Buffer with BinarySchema

[jpage-godaddy]

This fixes the ability do have types like:

type Photo = {
  id: number,
  caption: string,
  content: Buffer
};

const schemaProps: SchemaMap<Photo, true> = {
  id: Joi.number(),
  caption: Joi.string(),
  content: Joi.binary()
};

[Marsup]

Thanks!