Add return type for view loader.

When _ci_return is TRUE.
diff --git a/system/core/Loader.php b/system/core/Loader.php
index 2eef997..e096251 100644
--- a/system/core/Loader.php
+++ b/system/core/Loader.php
@@ -415,7 +415,7 @@
 	 *				to be extracted for use in the view
 	 * @param	bool	$return	Whether to return the view output
 	 *				or leave it to the Output class
-	 * @return	void
+	 * @return	void|string
 	 */
 	public function view($view, $vars = array(), $return = FALSE)
 	{
@@ -1293,4 +1293,4 @@
 }
 
 /* End of file Loader.php */
-/* Location: ./system/core/Loader.php */
\ No newline at end of file
+/* Location: ./system/core/Loader.php */