Support Whitehall formats
Refactor for readability
Require government/ prefix for Inside Government
WHITEHALL_FORMATS => INSIDE_GOVERNMENT_FORMATS

Use the name of the "concern" rather than the name of the application that
happens to fulfill them at the moment.
Record Inside Gov formats w more granularity
Merge pull request #58 from alphagov/support_whitehall_formats

Support Whitehall formats