v4.2.0

What's Changed

• Add new App event "page", emitted when a new Page instance is created by @ericyhwang in #640
  • This can be used to customize Page instances after creation.
  • The event is emitted both during server-side rendering, as well as during client-side initialization and page changes.

Doc updates

These were automatically deployed to the doc site upon merge and aren't part of the published package.

• [docs] Fixes and style improvements for GitHub Pages doc site by @ericyhwang in #637
• introduce a troubleshooting guide for Derby by @aconrad in #541
• Integrate troubleshooting guide into doc site nav by @craigbeck in #639

Full Changelog: v4.1.3...v4.2.0