Fixes #4494
It's safe to use this as we don't use any platform specific Node.js features.
* 2.4.2 * Appveyor tests no longer breaks due to chrome installation. See: https://goo.gl/pNe7iu It failed randomly due to some checksum issues. Since we don't care about privacy or security in the CI, we can ignore checking the checksum.
* Allow to test on Node.js v4 * Add appveyor.yml file * Update appveyor badge to master branch.