upgrade selenium to 2.38.0
upgrade selenium to 2.38.0

0000000009/selenium-standalone,stephenparish/selenium-standalone,timminkov/selenium-standalone,silvenon/selenium-standalone,adjohnson916/selenium-standalone,DenisGorbachev/selenium-standalone,amiablekrishna/selenium-standalone,rocketsue/selenium-standalone,btelles/selenium-standalone