added getId method

Author: Raaghu

src/Session/Session.php

@@ -18,6 +18,12 @@ interface Session {
 	 */
 	static function getInstance();
 
+	/**
+	 * This method eturns the session id
+	 * @return string , session id
+	 */
+	function getId();
+	
 	/**
 	 * Returns the session value stored for this key , null if no value is available for the provided key
 	 * @param $key string in JSON format representing a unque path to a value

tests/Session/SampleSessionImpl.php

@@ -23,6 +23,12 @@ static function getInstance(){
 		return self::$instance;
 	}
 
+	/**
+	 * This method eturns the session id
+	 * @return string , session id
+	 */
+	function getId(){}
+	
 	/**
 	 * Returns the session value stored for this key , null if no value is available for the provided key
 	 * @param $key string in JSON format representing a unque path to a value

tests/Session/SampleSessionWithoutInterface.php

@@ -23,6 +23,12 @@ static function getInstance(){
 		return self::$instance;
 	}
 
+	/**
+	 * This method eturns the session id
+	 * @return string , session id
+	 */
+	function getId(){}
+	
 	/**
 	 * Returns the session value stored for this key , null if no value is available for the provided key
 	 * @param $key string in JSON format representing a unque path to a value