Fix test__doctest under Python3.4

gevent/event.py

@@ -153,7 +153,7 @@ class AsyncResult(object):
         >>> try:
         ...     result.get()
         ... except ZeroDivisionError:
-        ...     print 'ZeroDivisionError'
+        ...     print('ZeroDivisionError')
         ZeroDivisionError
     """
     def __init__(self):

gevent/timeout.py

@@ -33,7 +33,7 @@ class Timeout(BaseException):
 
         >>> import gevent
         >>> gevent.Timeout(0.1).start()
-        >>> gevent.sleep(0.2)
+        >>> gevent.sleep(0.2)  #doctest: +IGNORE_EXCEPTION_DETAIL
         Traceback (most recent call last):
          ...
         Timeout: 0.1 seconds
@@ -132,7 +132,7 @@ class Timeout(BaseException):
 
     def __str__(self):
         """
-        >>> raise Timeout
+        >>> raise Timeout #doctest: +IGNORE_EXCEPTION_DETAIL
         Traceback (most recent call last):
             ...
         Timeout