Revert " set version to 1.0.0"

backport from branch_1.0 but I don't want to change version

This reverts commit 29026061.

craw/__init__.py

@@ -25,8 +25,9 @@
 
 import sys
 import logging
+import time
 
-__version__ = '1.0.0'
+__version__ = '1.dev{}'.format(time.strftime('%Y%m%d'))
 
 
 def get_version_message():