Adding controller method limits documentation and examples

Added a note on how to utilize controller method limits in
application/config/rest.php; Added example controller method limits in
application/controllers/api/example.php

Author: rdlaitila

application/config/rest.php

@@ -420,6 +420,12 @@
 	  PRIMARY KEY (`id`)
 	) ENGINE=InnoDB DEFAULT CHARSET=utf8;
 |
+| To specify limits, within your Controller __construct() method add per-method 
+| limits with:
+
+ $this->method['METHOD_NAME']['limit'] = [NUM_REQUESTS_PER_HOUR];
+ 
+| See application/controllers/api/example.php for examples. 
 */
 $config['rest_enable_limits'] = FALSE;
 

application/controllers/api/example.php

@@ -18,7 +18,20 @@
 
 class Example extends REST_Controller
 {
-	function user_get()
+	function __construct()
+    {
+        // Construct our parent class
+        parent::__construct();
+        
+        // Configure limits on our controller methods. Ensure
+        // you have created the 'limits' table and enabled 'limits'
+        // within application/config/rest.php
+        $this->methods['user_get']['limit'] = 500; //500 requests per hour per user/key
+        $this->methods['user_post']['limit'] = 100; //100 requests per hour per user/key
+        $this->methods['user_delete']['limit'] = 50; //100 requests per hour per user/key
+    }
+    
+    function user_get()
     {
         if(!$this->get('id'))
         {