[#374]Add field for owner organisation
[#374] Test what objects are available here
[#374] Show warning only when organisation content is owned
Merge remote-tracking branch 'origin' into feature/374_org_api_flag
[#374] Edit the alert message when an Organisation's content is managed
by another organisation

Add links to the managing organisation and email of the contact.

Use support@akvo.org as fallback email if there is none for the
managing organisation.

Use the Django admin styling to highlight the message.
Merge pull request #455 from akvo/feature/374_org_api_flag

Feature/374 org api flag - @zzgvh and @stellanl have worked together to confirm this.