Bootstrap 3.3.5 发布 Web 前端 UI 框架

Bootstrap 3.3.5 发布，该版本着重修复了 bug，改进辅助功能，以及文档更新。值得关注更新如下：

Updated to Normalize.css v3.0.3.
List groups now support <button> elements.
Cleaned up some extraneous padding on jumbotrons across various viewports.
Fixed input group sizing classes on all supported elements for real this time.
Applied a few tooltip and popover positioning fixes.
Fixed behavior when using tooltips and popovers that are triggered by multiple events.
Fixed some memory leakage in the tooltip and popover plugins.
Fixed incorrect Affix positioning when a webpage has a sticky footer.
Fixed npm package to include all Grunt scripts, so that grunt dist works if you installed Bootstrap from npm.