adding public_activity
Merge pull request #91 from cremalab/serialization-90-MAO

Serialization 90 mao
add acitivity to ideas, votes, comments, and idea threads. #92
merge master
fix group scoping with new serializers
activity serializer
adding comments to activity feed. #92
Adding related_activities to IdeaThread and adding controller tests. #92
related activities tests on models. #92
moving activity creation to model message method. PrivatePub events for activities. closes #92
use to_json to avoid parsing issues. #92
move comment activity creation to model. #92
Merge pull request #93 from cremalab/activity-feed-92-rb

Activity Feeds
Send PrivatePub Activities through serializers. #92
aliasing owner_id to user_id in Activity json. #92
Merge current mail branch
Wrote the email filter for idea_thread_controller