AMP Opt-in Forms

Segment now includes a new RuleGroups member, instead of a Rules member.

So for example, when you _previously_ would have created a segment like so:

```php
$result = $wrap->create('Segments List ID', array(
	'Title' => 'Segment Title',
	'Rules' => array(
		array(
			'Subject' => 'EmailAddress',
			'Clauses' => array(
				'CONTAINS example.com'
			)
		) ,
		array(
			'Subject' => '[customfield]',
			'Clauses' => array(
				'PROVIDED',
				'EQUALS 1'
			)
		)
	)
));
```

You would _now_ do this:

```php
$result = $wrap->create('Segments List ID', array(
	'Title' => 'Segment Title',
	'RuleGroups' => array(
		array(
			'Rules' => array(
				array(
					'RuleType' => 'EmailAddress',
					'Clause' => 'CONTAINS example.com'
				)
			)
		) ,
		array(
			'Rules' => array(
				array(
					'RuleType' => '[customfield]',
					'Clause' => 'PROVIDED'
				) ,
				array(
					'RuleType' => '[customfield]',
					'Clause' => 'EQUALS 1'
				)
			)
		)
	)
));

The Add Rule call is now Add Rule Group, taking a ruleGroup argument instead of a rule argument.

function CS_REST_Segments->add_rulegroup($rulegroup)

So for example, when you previously would have added a rule like so:

$wrap = new CS_REST_Segments('Segment ID', $auth);
$result = $wrap->add_rule(array(
    'Subject' => 'EmailAddress',
    'Clauses' => array('CONTAINS example.com')
));

You would now do this:

$wrap = new CS_REST_Segments('Segment ID', $auth);
$result = $wrap->add_rulegroup(array(
    'Rules' => array(
        array(
            'RuleType' => 'EmailAddress',
            'Clause' => 'CONTAINS example.com'
        )
    )
));

This introduces some changes to how you authenticate using this library. You now authenticate by passing an $auth array as the first argument when creating instances of any classes which inherit from the CS_REST_Wrapper_Base class.

So in existing code, when you previously would have authenticated using an API key as follows:

$wrap = new CS_REST_General('Your API Key');
$result = $wrap->get_clients();

If you want to authenticate using an API key, you should now do this:

$wrap = new CS_REST_General(array('api_key' => 'Your API Key'));
$result = $wrap->get_clients();