moved bootstrap to extension

composer.json

@@ -16,6 +16,7 @@
 	"require": {
 		"php": ">=5.4.0",
 		"yiisoft/yii2": "dev-master",
+		"yiisoft/yii2-bootstrap": "dev-master",
 		"yiisoft/yii2-debug": "dev-master",
 		"yiisoft/yii2-gii": "dev-master"
 	},