* beautify code block with google-code-prettify
* prettyPrint when componentDidMount
* css style for code block
* skip rule 'no-unresolved' for eslint
* conflict with webpack resolve path
* refactor all code block in example folder with component <Code />
* refactor scss folder structure
* specify the responsibility for each stylesheet with file name
* load local color themes, tomorrow, for google code prettify
* re-select demo color and save into variable
* unify the color system for storybook
* add yarn.lock
* test environment setup with jest
* allow eslint to suit for jest
* run lint before starting testing
* disable deprecated rule of 'react/jsx-space-before-closing'
* add CONTRIBUTING document
* specify how to start testing
* add Enzyme for React testing
* add testing template for bootstrap-table