* Replace node-spellchecker with Electron builtin spellchecker
* Fix word match unit tests
* Fix issue to enable spell checker if it was disabled at startup
* Fix spell checker was always disabled on macOS
* Code cleanup
* Fix circular dependency in Muya
Fix circular dependency between config/index.js and utils/index.js in Muya.
Replaced the key manager by atom-keymap to support non-US keyboards and
dead key translation on macOS and Windows. In addition, a GUI for key
bindings was added.
* Fix tests and improve CI
* Add xvfb to Linux - still problems with Mocha e2e tests
* Disable Webpack Bundle Analyzer for testing
* Use preinstalled yarn application on AppVeyor
* Fix build failure with latest vue version
* Remove "markdown-toc"
* Fix application title unit test
* Hide electron window during unit tests
* Add basic muya unit tests
* Dirty markdown-toc replacement
* Update dependencies
* Update eslint packages and configuration
