Add first iteration of validator for flattened dashboard modules
Process tabbed modules and all GroupBy params
Improve reporting
In some cases, no query parameters are needed so don't error
Add a README
Ignore binary
Make it faster

- added a pipeline to make it concurrent, with producers and consumers
- reverse the order so that we have descending order of slowness
Start recording response size
Define InvalidFlattenError to signal that flatten=true was requested without group_by
Improve error handling and reporting of response sizes
Omit InvalidFlattenErrors from the final report, as it is only useful for internal signalling
Merge pull request #49 from alphagov/flatten-validator

Add a validator for flatten=true