Added author comments to the css file

src/bootstrap-table.css

@@ -1,3 +1,9 @@
+/**
+ * @author zhixin wen <wenzhixin2010@gmail.com>
+ * version: 1.6.0
+ * https://github.com/wenzhixin/bootstrap-table/
+ */
+ 
 .bootstrap-table .table {
     margin-bottom: 0 !important;
     border-bottom: 1px solid #dddddd;