When killing java.exe process, send stderr to nul
Today's Opera v23 is not supported

I'm aborting efforts on operadriver because the last supported opera is
very old.  It seems they haven't made effort to support webdriver.

https://code.google.com/p/selenium/wiki/OperaDriver

Current implementation of OperaDriver supports only 12.x and older
versions of Opera browser (based on Presto engine) and does not support
newer versions (based on Blink engine).