4.0.0

• Rename library to Europa 🌑 and move package from html-md to europa
• Rewrite entire code base from ground up and adopt OOP pattern (no more CoffeeScript)
• Release fresh code base under MIT license
• Split into multiple modules (europa for browser, node-europa for Node.js, europa-core to support all environments, europa-test for testing)
• Add support for plugins (and the concept of presets)
• Restructure code base to make it more maintainable
• Remove documentation generated by docco
• Add .editorconfig to help contributors using compatible editors
• Remove INSTALL.md and consolidate contents into README.md and CONTRIBUTING.md
• Switch to container-based Travis builds for faster boot times
• Remove noConflict method
• Remove version field
• europa: Change global variable to Europa
• europa: Use Rollup to bundle source code into distribution files
• europa: Replace component.json with bower.json for proper Bower support
• europa: Add demo.html to allow contributors to experiment and test changes locally
• europa: Add live demo link to README.md
• europa: Add download links to README.md for browser distribution files
• europa-test: Create europa-test framework to help test europa-core implementations
• europa-test: Replace nodeunit with mocha and chai
• node-europa: Create node-europa specifically for using Europa in Node.js
• node-europa: Rename command from htmlmd to europa
• node-europa: Rename --base option to --base-uri
• node-europa: Remove --debug option
• node-europa: Remove --long-ext option
• node-europa: Remove --print option to simplify I/O streaming
• node-europa: Remove man page (for now at least)
• node-europa: Upgrade jsdom to v11 (no more problems for Windows users!)
• node-europa: Require Node.js version 6 or newer to be installed to be compatible with jsdom v11