new method, retrieve_authorization_headers, for checking for the authorization headers in $_SERVER['HTTP_AUTHORIZATION'] as well as getallheaders if the function exists
use apache_request_headers instead of getallheaders since that is just an alias
Better to use array_key_exists
$token should be $this->token
Don't mix PR commits
Merge pull request #35 from jtsternberg/master

Check auth headers in multiple locations