Fix warnings and rename misleading function.
Add (failing) behave tests for create endpoint.
Add new "behave" rules for collections endpoint
Add new methods to Database class
Implement the "create collection" endpoint
Add special bearer token to configuration

For development and test environments. This is required to write to the
"create collection" endpoint.
Merge pull request #238 from alphagov/create-collection-endpoint

Create collection endpoint
Add `customer-satisfaction` rule to 'updated at' migration
 - Also swicthes to `db.get_collection` method to comply with new Database object
 - Customer satisfaction data is coming in daily, so update expectation is set to 25hrs
Merge pull request #239 from alphagov/update_last_time_expected_migration

Add `customer-satisfaction` rule to 'updated at' migration