Use an up-to-date structure.sql from Transition
Remove detailed spec output

It's really noisy and doesn't add anything. The default still prints out the
test failures.

This also makes it consistent with Transition.
Merge pull request #83 from alphagov/remove_detailed_spec_output

Remove detailed spec output
Remove some #try from attributes_for_render

* By the time we're here, we're at a recognised host, which necessarily
  implies an associated site and org
* Some things may still not be there, but those things are limited to:
  * A mapping (implies 404)
  * A TNA timestamp (implies nothing very much, as a default will be generated)
Merge pull request #82 from alphagov/update_structure_sql

Use an up-to-date structure.sql from Transition
Merge pull request #85 from alphagov/try-there-is-no-try

Remove some #try from attributes_for_render