Added Assoc array support (#1)

* Added support for outputting an assoc array

PHP's implementation of json_decode also supports an $assoc param that allows you to output an associative array instead of an object.

* some proper formatting

* Update README.md

README.md

@@ -44,4 +44,13 @@ Add extra data to fields like multiselect, in this example add icons from multip
 	{% endfor %}
 </div>
 ```
-[Dale Inverarity](http://dale.wtf/) © 2015 - All rights reserved
+
+## Options
+
+By default `json_decode` outputs an object but you can also output an associative array by passing `true` as a parameter value to the filter.
+
+```php
+{% set icon = rawicon | json_decode(true)  %} 
+```
+
+[Dale Inverarity](http://dale.wtf/) © 2015 - All rights reserved

jsondecodetwigfilter/twigextensions/JsonDecodeTwigExtension.php

@@ -25,8 +25,8 @@ public function getFilters() {
         return $returnArray;
     }
 
-    public function json_decode($json) {
+    public function json_decode($json, $assoc = false) {
 
-        return json_decode($json);
+        return json_decode($json, $assoc);
     }
-}
+}