Make "priority" key optional, add "options" key
Make "priority" key optional, add "options" key

The priority can now be set to a default value. Since some strategies
might need options to work, an options key can be passed to the
stategy too.

Example:

array(
  'name'     => 'SlmLocale\Stategy\Subdomain',
  'priority' => 10,
  'options'  => array(
      'pattern' => '%s.my-domain.tld'
  ),
);

3makkk/SlmLocale,prolic/SlmLocale,juriansluiman/SlmLocale,swiftchase/SlmLocale