Fix: Update peer dependencies

* Remove React 0.14, it was broken for a long time.
* Remove webpack 2 betas, add webpack 3+

Close styleguidist#498.

Fix: Add deprecation warning for webpack 1 (styleguidist#503)

Fix: Webpack 3 support (styleguidist#502)

Fix: Check if @example file exists (styleguidist#500, close styleguid…

…ist#493)

Fix: Remove border from TabButton (styleguidist#490)

Fix missing title in function descriptions (styleguidist#492)

Fix: Styles of the last column (close styleguidist#481)

Fix: Pass showUsage option to the frontend

Changelog: 🚀

## New features

### UI refresh

Welcome our refined UI! More consistent and clean:

![](https://d3vv6lp55qjaqc.cloudfront.net/items/3j1P0K1a1Q451t2Z2p3G/Screen%20Recording%202017-06-08%20at%2008.54%20PM.gif)

🦊 This is the first part of the planned improvements and a base for upcoming plugin API, see styleguidist#426 and styleguidist#354 for more details — we need your feedback there 🚀

🍕 Thanks to @SaraVieira and @n1313 for help! ❤️

### Props & methods are hidden by default

Use the new config option [showUsage](https://react-styleguidist.js.org/docs/configuration.html#showusage) to restore the old behavior.

## Bug fixes

### Crash when using a defaultProp that is not listed in props (styleguidist#437 by @ankri)

### Isolated examples inside sections

### Issues with `position: relative` (styleguidist#441)

### Ugly isolated example link (styleguidist#235)

Fix: Update docs links to the site insted of GitHub