adding a UTF8::clean() on the message on the error view

so we don't get "htmlspecialchars() [function.htmlspecialchars]: Invalid multibyte sequence in argument" errors
Merge branch 'refs/heads/kohana_v3.3/fix/error_view_html_chars' into kohana_v3.3/master
adding /login to the disallowed urls in robots.txt
Merge branch 'refs/heads/kohana_v3.3/feature/robots_disallow_login' into kohana_v3.3/master