Merge pull request #57 from d0ngw/master

Fix chrome driver can't quit

webmagic-selenium/src/main/java/us/codecraft/webmagic/downloader/selenium/WebDriverPool.java

 package us.codecraft.webmagic.downloader.selenium;
 
+import org.apache.log4j.Logger;
 import org.openqa.selenium.WebDriver;
 import org.openqa.selenium.chrome.ChromeDriver;
 
@@ -16,6 +17,7 @@ import java.util.concurrent.atomic.AtomicInteger;
  * Time: 下午1:41 <br>
  */
 class WebDriverPool {
+    private Logger logger = Logger.getLogger(getClass());
 
     private final static int DEFAULT_CAPACITY = 5;
 
@@ -81,8 +83,8 @@ class WebDriverPool {
             throw new IllegalStateException("Already closed!");
         }
         for (WebDriver webDriver : webDriverList) {
-            webDriver.close();
+            logger.info("Quit webDriver" + webDriver);
+            webDriver.quit();
         }
-
     }
 }