z在desiredCapabilities里新增这俩居然fix了问题，原因暂时不得而知：
capabilities.setCapability("unicodeKeyboard", "True");
capabilities.setCapability("resetKeyboard", "True");
A new session could not be created. (Original error: Requested a new session but one was in progress) ）错误解决办法
原文：http://www.cnblogs.com/melody-emma/p/4826595.html
