Adds timezone support
I changed the references to datetime.datetime.now to timezone.now from django.utils (source here
That way, if USE_TZ=False in settings, will use standard datetime. Otherwise, will have timezone support.
(sidenote: Yes, I'm making a pull request just to fix a warning. Why did I go to the trouble of doing that? I have to import around 400k things into a django instance which generate vote actions. The warnings alone were causing a 15 second delay for each 1000 votes. So, advantages of opensource right there!)
Not sure how @paltman and @jtauber would feel about changing this. datetime is still used elsewhere in the app. Would it be strange to change it in only once place?