Removes plpgsql comment for Heroku compatibility
Removes plpgsql comment for Heroku compatibility

https://help.heroku.com/AHH2KNSR/why-do-i-get-postgres-extension-errors-when-i-run-rake-db-structure-load-or-rake-db-setup
galahq/gala,michigan-sustainability-cases/gala,galahq/gala,michigan-sustainability-cases/gala,michigan-sustainability-cases/gala,galahq/gala