v4.1.0

This is a maintenance release.

Improvements

• Simplify and remove unused css resources in common/css, and add the existing files to sass-resources-loader. See webpack/constants.js.
• Only use dotenv-safe in development environment. In production, it is assumed that environment variables will actually be set in the OS, as opposed to using a .env file.
• Properly support redux-devtools-extension.

New Features

• Use react-helmet to manage document titles.
• Add redux-thunk middleware to for asynchronous actions, and add an example showing how to use it to fetch todo items.
• Add a server-side API (dummy response data) to fetch todos, using async/await.
• Update server-side code to support the fetchData() method in a given component tree, so that we can render components server-side that require fetched data.