Return 403 instead of 500 if no CSRF token given

Not supplying a CSRF token shouldn't return a 500 response because it isn't a server error. The response status code should definitely be in the 400's, because it's the client's fault. And it should be a 403 because the client is forbidden from making that request without the appropriate credential (the CSRF token), though the request may be otherwise valid.

http://en.wikipedia.org/wiki/List_of_HTTP_status_codes
Add setting ['composer_autoload']

Supersedes PR #3132
[ci skip] Add a note about CI_Driver (issue #3140)
Fix CI_Encryption::substr() usage of mb_substr()

The whole point was to use 8bit encoding
Fix CI_Encryption::substr() for PHP 5.3

Nothing critical, just an edge case that isn't currently used
Add changelog entry for CSRF status code; remove line at EOF
Merge pull request #3134 from kdazzle/patch-1

Return 403 instead of 500 if no CSRF token given
update