Adding consolidated ActivityFeed sorted oldest to newest. #89
halfway messed up progress. #89
Fixing comment Collection creation for ideas. #89

- create the collection on init and parse
- update the collection's url and idea id when the idea actually
  has an ID.
- update comment count at the right time
comments button opens activity feed. #89
fixing some tests #89
Merge pull request #90 from cremalab/activity-feed-89-rb

Activity feed