moved validator to resources.
changed interface; accept $input using setInput.
use CommentVadlidator to check if comment is set.
use PostValidator as well; set it in the Factory.
change the title of edit.php.
use PageView and goto statement to control the html view.
one less dependency; use double-back-slash in DQL.
add comment using post.php itself.
add onPostComment method etc.
fix true/false being wrong in onPut/Post methods.
show some error message.