Fix internal organization naming

Great big search/replace
Make org naming consistent
Validate uniqueness of organization names

Resolves theodi/open-orgn-services#186
Merge branch 'refs/heads/master' into feature-186-unique-org-name
Merge branch 'refs/heads/master' into feature-186-unique-org-name
Update feature for text change
Check that organization names are validated for duplication on signup
Obsessive formatting tidyup
Add test for validation on organization name editing
Merge pull request #71 from theodi/feature-186-unique-org-name

Make organization names unique