[workflow] Add .jshintrc
[test] Add tests node.js side
[test] Add common tests
[v1] refacto (src)

  * See [ChangeLog](https://github.com/unitjs/unit.js/blob/master/CHANGELOG.md)
[tasks] Add builder for browser
[browser] Add browser support
[Makefile] Update

  * Add the command `browser-build`.
  * Update the command `test` (Mocha launcher)
[CONTRIBUTING] Add info for plugin creation
[doc] Add CHANGELOG
[test] Move sinon.js
[doc] Update README for v1
[test] Move test of fake timer
[tasks] update the order of webpack plugins
[assertions] Replace should.js by must.js in headers assertions
[browser] Rebuild
[package.json] Release v1.0.0
[v1] Refacto