only store source files in repo

assets/less/bootstrap/bootstrap.less

@@ -1,3 +1,9 @@
+/*!
+ * Bootstrap v3.3.6 (http://getbootstrap.com)
+ * Copyright 2011-2015 Twitter, Inc.
+ * Licensed under MIT (https://github.com/twbs/bootstrap/blob/master/LICENSE)
+ */
+
 // Core variables and mixins
 @import "variables.less";
 @import "mixins.less";