Merge lp://qastaging/~qzhang/lava-dashboard/user-notification into lp://qastaging/lava-dashboard

Fix some errors

Fix some errors and tried on local deployment

tested

Hi, this is a good start. There are some things that should be improved before landing though I think:

1) I think the notification_list view should be marked login_required.
2) I don't see the notification page being added to ME_PAGE_ACTIONS -- did you mean to merge my branch or reimplement this yourself?
3) Can you make the box from which you select the bundle streams to subscribe to much bigger? I guess you can do this just using CSS if there's no neat way to do this in Django.
4) Can you add Notification to the admin interface? (See admin.py) I always forget to do this!
5) You might want to add a unique_together constraint to Notification (https://docs.djangoproject.com/en/dev/ref/models/options/#unique-together) -- this will eliminate the need for the fixme you have about MultipleObjectsReturned
6) The calculation of 'init' in the view function is querying the wrong table -- you want to query the bundlestreams that 'request.user' is already subscribed to, which you can do like this:

    init = BundleStream.objects.filter(
        notification__user=request.user, notification__if_notify=True)

7) You need to set the existing notifications to if_notify=False _before_ you set the ones in the form to true -- otherwise if_notify is always false!

So that's quite a lot of comments sorry, but I don't think any of them should be too hard to address. I haven't tested the emailing code yet, but that _looks_ OK...