Move pending migrations into migration folder

The features these migrations relate to have now long been deployed and
verified to work. We can now safely drop the legacy data.
Merge pull request #1539 from alphagov/run-pending-migrations

Move pending migrations into migration folder
Correct migration and update schema.rb
Use ; to separate lists of elements with commas
Merge pull request #1540 from alphagov/correct-migration-and-update-schema

Correct migration and update schema.rb
Merge pull request #1541 from alphagov/comma-separated-keywords

Use ; to separate lists of elements with commas

https://www.pivotaltracker.com/story/show/69434416
Sub-orgs display the same as other org types
Parents of sub-orgs display in header
remove styling rules for non-existant .sub-org-name