Add note to readme about maintainer
Throw http exception on Comment Persist if thread is not commentable

This PR checks if the thread is commentable and throws a proper access denied http exception.
Merge pull request #443 from toinouu/patch-2

Throw http exception on Comment Persist if thread is not commentable
The template expects commentId to be set. 

This solves a 500 error.
Merge pull request #447 from tarjei/patch-5

The template expects commentId to be set.
Merge remote-tracking branch 'remotes/upstream/master'

Conflicts:
	Controller/ThreadController.php