Update configuration for Heroku

Signed-off-by: Marcel Oomens <Marcel.Oomens@cromido.org>
Set-up staging environment

bug in settings.py

Signed-off-by: Marcel Oomens <Marcel.Oomens@cromido.org>
Bug fix

PostgreSQL doesn't support comparisons on JSON fields

Signed-off-by: Marcel Oomens <Marcel.Oomens@cromido.org>
Bug fixes

Signed-off-by: Marcel Oomens <Marcel.Oomens@cromido.org>