Look for chromedriver on the system PATH too

Note that the PATH when running in your IDE may not match the PATH in your shell.  I had to put a symlink for `chromedriver` into `/usr/local/bin`, because the PATH was only: `/usr/local/bin:/usr/bin:/bin`
Isn't it against [The Rules™](https://www.securecoding.cert.org/confluence/display/java/MET02-J.+Do+not+use+deprecated+or+obsolete+classes+or+methods) to introduce usage of deprecated functions?