Merge pull request #12 from techjewel/master

return 'SubscriptionArn' from subscribe method

Author: chrisbarr

lib/AmazonSNS.php

@@ -385,21 +385,21 @@ public function setTopicAttributes($topicArn, $attrName, $attrValue) {
 	 * @param string $topicArn
 	 * @param string $protocol - http/https/email/email-json/sms/sqs
 	 * @param string $endpoint
-	 * @return bool
+	 * @return string $SubscriptionArn
 	 * @throws InvalidArgumentException
 	 */
 	public function subscribe($topicArn, $protocol, $endpoint) {
 		if(empty($topicArn) || empty($protocol) || empty($endpoint)) {
 			throw new InvalidArgumentException('Must supply a TopicARN, Protocol and Endpoint to subscribe to a topic');
 		}
 
-		$this->_request('Subscribe', array(
+		$response = $this->_request('Subscribe', array(
 			'TopicArn' => $topicArn,
 			'Protocol' => $protocol,
 			'Endpoint' => $endpoint
 		));
 
-		return true;
+		return strval($response->SubscribeResult->SubscriptionArn);
 	}
 
 	/**