Bump to React 16.3 and styled-components 4.0.0

This change deprecates React < 16.3 and styled-components < 4

Upgrade styled-components

• #95, upgrade styled-components to latest version and move to peerDependencies

Lazy loading

• Support AsyncPanel: can lazy loading panel content

Fix React 15 bug

• Fix #79, rm React.Children.map api, to make lib work on v15

v1.0.0

Breaking changes for API and features

These are features supported in v1.0.0:

• Mobile supported — Touch support. Easy to use on mobile device
• Draggable tab — Support drag and drop tab
• Add & Delete — Tab can be added and deleted
• Customizable style — Based on styled-components, super easy to customize tab style
• API based — All actions are controllable