Comment Flagging As Inappropriate

This branch deals with:

* Vistor can flag a comment on a product page as inappropriate. Currently, you don't have to be logged in to do this. Do we want to specify this?

* Platform Admin can view all flagged comments and mark as 'active'/'inactive'

* Added a few comments with status 'flagged' to the seed data

* Added a link to manage flagged comments on platform admin's main page, admin store index

*Views for all these things are created in rough draft.... they could use some styling love.

I think that's it.