use Jest

• Update dependencies
• use Jest

Use Flow

• use Flow
• remove Spinner component and use CSS instead
• refactor hardcode string

remove lodash

remove lodash

Remove jss

• remove jss

Remove spin.js

Remove spin.js and replace by spinkit

Update dependencies

• enable yarn
• update deps

Clean up code

v1.2.0

1.2.0

Enzyme

Use enzyme

1.0.0

go live