[Java] Add toString() to DefaultElementLocator

Add toString() method to DefaultElementLocator and child classes in oder to display descriptive message instead of object's class name and hash code when TimeoutException is thrown while using PageFactory.

Signed-off-by: Alexei Barantsev <barancev@gmail.com>

Author: glibas

java/client/src/org/openqa/selenium/support/pagefactory/DefaultElementLocator.java

@@ -89,4 +89,9 @@ public List<WebElement> findElements() {
 
     return elements;
   }
+
+  @Override
+  public String toString(){
+    return this.getClass().getSimpleName() + " '" + by + "'";
+  }
 }