* update deps
* update node version in CI file
* update node version in .babelrc
* update node version to 10
* update electron
* update karma-electron
* update element-ui etc
* update vega-embed etc
* update webpack-dev-server
* fix: commonmark example 475 failed
* fix some strong and em commonmark examples failed test
* remove some debug code
* fix: cm example 353
* fix: cm example 387
* remove ununsed codes
* use \s to replace unicode whitespace array
* fix 3 atx heading examples
* fix setext heading failed examples and image alt examples
* fix: example 520 and 521
* markedjs#1239, markedjs#1262: Escapedpipes
* markedjs#1303: add hard line break when backslash at EOL
* markedjs#1135: update the list of markdown escapes, per commonmark
* markedjs#1224: fix unsafe heading regex
* markedjs#1023: new blockquote rule: match any paragraph-like content up to next line
* markedjs#1245: GFM table compliance
* markedjs#1013, markedjs#1181 fix backticks in inline code and em
* markedjs#1351: fix emphasis closing by single _
* markedjs#1034: make autolinks compliant
* markedjs#1387: fix language identifier parsing
* Restore table escape characters
* 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