Likes and favorites

[brussell98]

Allow users to like and favorite posts, which will also show on their profile, or make searching them easier.

• [x] Store IDs on their user for fast access
• [x] When an image is deleted run code below
• [x] Store total likes and favorites received on profile

Clean removal:

User.update({ favorites: { $exists: true, $ne: [] } }, { $pull: { "favorites": image.id } });
User.update({ likes: { $exists: true, $ne: [] } }, { $pull: { "likes": image.id } });

[brussell98]

Likes and favorties