The Tested Release

• Rewritten Xvfb launch using Process.spawn and avoiding a shell
• Do not manually remove X11 lock file when stopping Xvfb; this isn’t conventional. Should eliminate some errors with not being able to find Xvfb
• More informative error messages
• Detect situation when Xvfb can’t listen to any sockets and raise corresponding error.
• If video recorder provider is libav, use avconv binary instead of ffmpeg
• Fixes to video recorder launch options (from @gpavlidi, @abotalov, @ynagorny, @WeAreFarmGeek)
• Customize launch timeout (from @ShockwaveNN)
• Properly working integration tests