Improvements

[omnidan]

• configure ./lib/index.js as entry script in package.json
• add commands to package.json (see redux-undo as an example)
• use local webpack version (/node_modules/.bin/webpack for package.json build commands)
• it should deal with npm build, npm start (builds and runs) and npm publish (on prepublish: build, run linter and tests)

Once this is done (make sure building works fine first!):

• publish coffea@1.0-beta2 via npm publish --tag beta
• publish coffea-slack@1.0-beta1 via npm publish