small bug fixes and selenium update

Had a few issues when running the container and figured I shoot the fix back upstream. Feel free to take some, all or none. Thanks for putting this image together!

This PR does the following
1. upgrade selenium to 2.43.1-2.9.0
2. sets a password for x11vnc
3. set apt environment variables as to not throw errors in headless env
4. don't append to apt google.list sources file