Configure Faraday to raise errors

This will prevent error swallowing when talking to Elastic Search
Merge pull request #21 from alphagov/raise-errors

Configure Faraday to raise errors
Rescue errors from repeat schema registrations
Merge pull request #22 from alphagov/allow-schema-re-registration

Rescue errors from repeat schema registrations
Pass a Hash to PanopticonRegister

The value for schema used to be a Hash but became an object after some
refactoring.
Merge pull request #23 from alphagov/fix-panopticon-rake-task

Fix Panopticon registration rake test