public async Task<IHttpActionResult> PutProject(int id, Project project)
        {
            if (!ModelState.IsValid)
            {
                return BadRequest(ModelState);
            }

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

	        project.Contributors.ForEach(c => db.Contributors.Attach(c));

	        db.UpdateGraph(project, map => map.AssociatedCollection(p => p.Contributors));

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

            return StatusCode(HttpStatusCode.NoContent);
        }
        public async Task<IHttpActionResult> PostProject(Project project)
        {
            if (!ModelState.IsValid)
            {
                return BadRequest(ModelState);
            }

            db.Projects.Add(project);
            await db.SaveChangesAsync();

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