Bootstrap 3.3.1发布

　　Bootstrap 3.3.1 发布，此版本现已提供下载（v3.3.1.zip），

　　Bootstrap 3.3.1 主要是 CSS 和 JS 的 bug 修复，大量的访问性改进和一些文档改进。更多内容请看更新日志或者 v3.3.1 milestone。

主要更新内容如下：

Forms

• #14234: Drop the IE specific hacks for temporal inputs and replace with a Safari media query hack to avoid the IE problems altogether.

Button groups

• #15086: Don't remove focus outline from buttons in button groups.

Badges

• #14915: Properly color badges in.activeitem of<ul>-based list groups.

• #15052: Fix active styles when in non-anchor.list-group-item.

Jumbotron

• #14979: Override.jumbotronpadding within.container-fluidto match.container.

Navbar

• #14965: Resetborder-radiuson top corners on dropdown menus in fixed bottom navbars.

Popovers and tooltips

• #14936, #15019: Fix some bugs in and deprecate diagonal placement classes for tooltips.

• #15046: Add full font overrides for popovers and tooltips.

Theme

• #14381: Correctly override active dropdown items in collapsed navbars in the theme.

• #15018: Correctly override active dropdown items in collapsed navbars.

JS

• #14925: Make button plugin's focus shim recognizefocusinevent in addition tofocusevent.

• #14931: Add workaround for seemingly spurious tooltip viewport unit test failures on iOS 8.

• #14927: Fix modal backdrop overlaying the modal's scrollbar.

• #14933: Center modal at all times.

• #14993: Have Carousel ignore keyboard events emited by<input>s or<textarea>s.

• #15088: Dropdown: Ignore keydown events coming frominputs andtextareas.

Docs

Browser bugs

• #14920: Add Wall of Browser Bugs entry for #14868.

• #14922: Add Wall of Browser Bugs entry for #14708.

• #14958: Add Wall of Browser Bugs entry for #14409.

• #14985: Add Wall of Browser Bugs entry for #14972.

Accessibility

• #14951: Assorted accessibility (and some consistency) fixes.

• #15009, #15085: Glyphicon accessibility improvements.

• #15087: Wash-up of some stray dropdown examples' ARIA roles.

Contributing guidelines

• #14949: Explain issue bots & PR bots inCONTRIBUTING.md.

• #14959: Mention common contributor mistakes inCONTRIBUTING.md.

Components, examples, etc

• #14917: Use HTML5<footer>tag in examples.

• #14945: Replace deprecated uses of.pull-left&.pull-rightin.mediadocs.

• #14986: Mention Safari font size issues with fixed-width.containers in Printing docs.

• #14989: Addevent.relatedTarget+data-*example of how to vary modal content based on which button activated the modal.

• #15015: Add initialization examples to tooltip and popover "Opt-in functionality" callouts.

• #15077: Document required.activeclass on one carousel slide.

Customizer

• #14954: Fixconfig.jsonfile upload widget event listener.

• #14980: Integrate Autoprefixer into the Customizer.

• #15031: Remove file type check from config import.

Build tools / Packaging

• #15072: HTML validation:X-UA-Compatiblenow validates, so remove it from the list of ignored errors.

• Update devDependencies