Add Jest

• Add unit test with Jest
• setup travis CI

Use yarn

use yarn instead of npm script

[Major] 2.0 release

Summary

2.0 new version major release

• replace semantic UI of Materialize
• replace reqwest with fetch
• refactor components
• restructure folder

dep update

dep update

dep update

dep update

Update to React 16

Update outdated dependencies and React 16

update dependencies

update dependencies

Refactor flowtype

Refactor flowtype

async/await

Use async/await

Update eslint airbnb

Update eslint airbnb