allow raw queries using a function argument

@robyoung
@maxfliri
Set environment to test when running tests.

@maxfliri
@robyoung
Allow raw queries by bucket

@maxfliri
@robyoung
Raw queries blocked on all buckets if no config property is defined

@robyoung
@maxfliri
Merge pull request #70 from alphagov/allow-raw-queries-by-bucket

Allow raw queries by bucket