Pretty URLs support

Support for Netlify's pretty URL resolving that allows to link to a html-page without its .html-extension.

Example: /about --> /about.html

Netlify Build Public Beta Compatibility

Pull requests

• #13 Update installation instructions (Jessica Parsons)
• #18 Upgrade to latest version of Netlify Build (ehmicky)
• #10 Update eslint-plugin-node to the latest version 🚀 (greenkeeper[bot])
• #9 Update nyc to the latest version 🚀 (greenkeeper[bot])

Commits to master

• Add prettier to eslint config instead of running it standalone (Peter Müller)
• Npm audit (Peter Müller)
• Update dependencies and adapt to netllify deprecatoing yaml config (Peter Müller)