Email sender - allow user to fill in destination email address and send a picture to someone
 /// <summary>
 /// Offers the option to email the image to someone
 /// </summary>
 /// <param name='pictureId'>
 /// ID of the picture we wish to email
 /// </param>
 private void SendEmail(Guid pictureId)
 {
     var filenameResolver = this.CreateFilenameResolver(pictureId);
     var emailSender = new EmailSender(this);
     emailSender.SendImage(filenameResolver.MasterImageFilename);
 }