public async Task<IHttpActionResult> PutRater(int id, Rater rater)
		{
			if (!ModelState.IsValid)
			{
				return BadRequest(ModelState);
			}

			if (id != rater.Id)
			{
				return BadRequest();
			}

			_db.Entry(rater).State = EntityState.Modified;

			try
			{
				await _db.SaveChangesAsync();
			}
			catch (DbUpdateConcurrencyException)
			{
				if (!RaterExists(id))
				{
					return NotFound();
				}
				throw;
			}

			return StatusCode(HttpStatusCode.NoContent);
		}
		public async Task<IHttpActionResult> PostRater(Rater rater)
		{
			if (!ModelState.IsValid)
			{
				return BadRequest(ModelState);
			}

			_db.Raters.Add(rater);
			await _db.SaveChangesAsync();

			return CreatedAtRoute("DefaultApi", new {id = rater.Id}, rater);
		}