Changed listeners extending the defaults

Changed listeners extending the defaults provided by zf-mvc-auth
Revert 68e90ff..8bbaaca

This rolls back to commit 68e90ffbcd1c034eaa6117cade5824e63de7842a.
Added the header go http response
Merge pull request #20 from tafax/master

Changed listeners by extending the defaults

Conflicts:
	src/MvcAuth/UnauthorizedListener.php
[#20] Better implementation

- Re-implemented to follow pattern implemented in 01c94dbc7b
Merge branch 'hotfix/20'

Close #20