public async Task<IHttpActionResult> PostAnnotatedTweet(AnnotatedTweet annotatedTweet)
        {
            if (!ModelState.IsValid)
            {
                return BadRequest(ModelState);
            }

            db.AnnotatedTweets.Add(annotatedTweet);

            try
            {
                await db.SaveChangesAsync();
            }
            catch (DbUpdateException)
            {
                if (AnnotatedTweetExists(annotatedTweet.Id))
                {
                    return Conflict();
                }
                else
                {
                    throw;
                }
            }

            return CreatedAtRoute("DefaultApi", new { id = annotatedTweet.Id }, annotatedTweet);
        }
        public async Task<IHttpActionResult> PutAnnotatedTweet(int id, AnnotatedTweet annotatedTweet)
        {
            if (!ModelState.IsValid)
            {
                return BadRequest(ModelState);
            }

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

            db.Entry(annotatedTweet).State = EntityState.Modified;

            try
            {
                await db.SaveChangesAsync();
            }
            catch (DbUpdateConcurrencyException)
            {
                if (!AnnotatedTweetExists(id))
                {
                    return NotFound();
                }
                else
                {
                    throw;
                }
            }

            return StatusCode(HttpStatusCode.NoContent);
        }