public async Task<IHttpActionResult> Put(EditAuthorViewModel model)
        {
            if(!ModelState.IsValid)
                return BadRequest(ModelState);

            using (var ctx = new NewsDbContext())
            {
                var author = new Author()
                {
                    Id = model.Id.Value,
                    Name = model.Name
                };

                ctx.Authors.Attach(author);
                ctx.Entry(author).State = EntityState.Modified;
                await ctx.SaveChangesAsync();

                return StatusCode(HttpStatusCode.NoContent);
            }
        }
        public async Task<IHttpActionResult> Post(CreateAuthorViewModel model)
        {
            if (!ModelState.IsValid)
                return BadRequest(ModelState);

            using (var ctx = new NewsDbContext())
            {
                var author = new Author()
                {
                    Name = model.Name
                };

                ctx.Authors.Add(author);
                await ctx.SaveChangesAsync();
                
                var data = new AuthorViewModel()
                {
                    Id = author.Id,
                    Name =  author.Name
                };

                return Created(new Uri(Request.RequestUri + "api/authors" + data.Id), data);
            }
        }