Issue #17 : Remove need for object brace notation.

At Weston's suggestion, pass second argument to json_decode.
This will then return an array, instead of an object.
So access the array value with $data[ $setting_id ].
Instead of previous object access with $data->{ $setting_id }.

php/class-post-type.php

@@ -719,9 +719,9 @@ public function filter_out_settings_if_removed_in_metabox( $content ) {
 		}
 
 		$setting_ids_to_unset = $_REQUEST[ $key_for_settings ];
-		$data = json_decode( $post->post_content );
+		$data = json_decode( $post->post_content, true );
 		foreach ( $setting_ids_to_unset as $setting_id ) {
-			unset( $data->{ $setting_id } );
+			unset( $data[ $setting_id ] );
 		}
 		$content = Customize_Snapshot_Manager::encode_json( $data );