[2.1] Added the Apache htpasswd support for HTTP Authentication

Added the Zend\Authentication\Adapter\Http\ApacheResolver component that supports the htpasswd format for authentication. The ApacheResolver uses the new Zend\Crypt\Password\Apache class to encrypt and check the passwords according with the htpasswd format.
For more detail: http://httpd.apache.org/docs/2.2/misc/password_encryptions.html