New notifications

- Added request.notifications
- Email configuration fixes
  - Set config_spec default SMTP port to `0` and switch to SSL/non-SSL
    default if `port == 0`
  - Added email_smtp_use_ssl configuration setting
- Added migrations for notification tables
- Added __repr__ to MediaComment(Mixin)
- Added MediaComment.get_entry => MediaEntry
- Added CommentSubscription, CommentNotification, Notification,
  ProcessingNotification tables
- Added notifications.task to celery init
- Fixed a bug in the video transcoder where pygst would hijack the
  --help argument.
- Added notifications
  - views
    - silence
    - subscribe
  - routes
  - utility methods
  - celery task
- Added half-hearted .active comment CSS style
- Added quick JS to show header_dropdown
- Added fragment template to show notifications in header_dropdown
- Added fragment template to show subscribe/unsubscribe buttons on
  media/comment pages
- Updated celery setup tests with notifications.task
- Tried to fix test_misc tests that I broke
- Added notification tests
- Added and extended tests.tools fixtures
- Integrated new notifications into media_home, media_post_comment views
- Bumped SQLAlchemy dependency to >= 0.8.0 since we need polymorphic for
  the notifications to work

mediagoblin/init/celery/__init__.py

@@ -16,12 +16,18 @@
 
 import os
 import sys
+import logging
 
 from celery import Celery
 from mediagoblin.tools.pluginapi import hook_runall
 
 
-MANDATORY_CELERY_IMPORTS = ['mediagoblin.processing.task']
+_log = logging.getLogger(__name__)
+
+
+MANDATORY_CELERY_IMPORTS = [
+    'mediagoblin.processing.task',
+    'mediagoblin.notifications.task']
 
 DEFAULT_SETTINGS_MODULE = 'mediagoblin.init.celery.dummy_settings_module'
 
@@ -97,3 +103,13 @@ def setup_celery_from_config(app_config, global_config,
 
     if set_environ:
         os.environ['CELERY_CONFIG_MODULE'] = settings_module
+
+    # Replace the default celery.current_app.conf if celery has already been
+    # initiated
+    from celery import current_app
+
+    _log.info('Setting celery configuration from object "{0}"'.format(
+        settings_module))
+    current_app.config_from_object(this_module)
+
+    _log.debug('Celery broker host: {0}'.format(current_app.conf['BROKER_HOST']))