[core] Apply common indentation

All files are now using tabs for indentation

formats/JsonFormat.php

@@ -3,19 +3,18 @@
 * Json
 * Builds a JSON string from $this->items and return it to browser.
 */
-class JsonFormat extends FormatAbstract{
+class JsonFormat extends FormatAbstract {
 
-    public function stringify(){
-        $items = $this->getItems();
+	public function stringify(){
+		$items = $this->getItems();
+		return json_encode($items, JSON_PRETTY_PRINT);
+	}
 
-        return json_encode($items, JSON_PRETTY_PRINT);
-    }
+	public function display(){
+		$this
+			->setContentType('application/json')
+			->callContentType();
 
-    public function display(){
-        $this
-            ->setContentType('application/json')
-            ->callContentType();
-
-        return parent::display();
-    }
+		return parent::display();
+	}
 }