Spotlight config json migrated to stagecraft

Includes a test in tools to verify this - it will loop through spotlight
configs and load spotlightified dashboard json for each. It will then
diff them and report on any differences in the imported models.
Token option and use correct environment hostname

Add an option to pass a token and use the environment hostname from
django settings rather than hardcoding both assuming the dev machine.
Get signon token from settings
Skip no-realistic dashboard

Now we validate modules, this contains invalid modules. But we
dont care about it anyway, so skip it
Allow module description to be blank

Some modules have an empty description - this wasnt picked up earlier
because we were not validating modules.
Use HTTPS rather than http

HTTP works on the dev vm but in "real" environments we use HTTPS -
posting over HTTPS will return a 301 which results in a get request
being made.
Merge pull request #225 from alphagov/spotlight-config-migration

Spotlight config migration