* allow user to customize class for header cell
* add corresponding story
* allow user to customize inline-style for header cell
* add corresponding story
* [test] unit test for headerStyle
* [test] unit test for headerClasses
* update Document
* wrapper components with Decorators to set component margin
* add sticker github-corners at welcome page
* refactor welcome page for storybook
* refactor scss code structure
* add type.js to animate sub title
* storybook environment setup
* customized loader
* add basic example of BasicTable
* add script to bootstrap storybook
* import bootstrap css for storybook
* update webpack.config for adding loader for font and css
* add sass loader and allow to customize css for storybook
* uncheck lint for react-bootstrap-table-example
* package example has its own lint check
* run yarn in each package when boostrapping lerna
* add peerDependencies for package example