PEP8
Merge pull request #375 from alphagov/pep8

PEP8
Quieten pip in travis builds
Merge pull request #376 from alphagov/quieten-pip

Quieten pip in travis builds
Add Celery dependency
Add transformers module with celery worker and skeleton write task
Add dev credentials for transformer rabbitmq user
Initial message dispatch implementation
Add rabbitmq test config
Merge pull request #374 from alphagov/emit-write-messages

Emit write messages
Extract config for transformers from write API
Merge pull request #378 from alphagov/emit-write-messages

Extract config for transformers from write API
Use write API config for celery tasks
Merge pull request #379 from alphagov/emit-write-messages

Use write API config for celery tasks