Split up create and get for Student Training Workflows
Merge pull request #383 from edx/sanchez/TIM-610-Fix-IntegrityErrors

Split up create and get for Student Training Workflows
Gracefully handle peer assessing before submitting a response
Merge pull request #387 from edx/will/ignore-peer-assesss-if-no-sub

Gracefully handle peer assessing before submitting a response
Gracefully handle when someone calls the self-assess handler without first making a submission
Merge pull request #385 from edx/will/ignore-self-assessment-if-no-sub

Gracefully handle self-assessment with no submission.
Update ddt to 0.8.0
Clean up logging in peer and self assessment mixins
Catch a peer API workflow exception
Merge pull request #391 from singingwolfboy/db/update-ddt

Update ddt to 0.8.0
Remove cache key versioning
Merge pull request #401 from edx/will/remove-cache-key-version

Remove cache key versioning
Merge pull request #392 from edx/will/log-peer-request-error

Clean up logging in peer and self assessment mixins
Pass over unknown workflow steps.
Added i18n tools to the requirements
Extract strings and generate dummy strings
Compiled messages
Merge pull request #406 from edx/sanchez/TIM-612-Workflow-API-Rollback-Support

Pass over unknown workflow steps.
Merge pull request #407 from edx/will/i18n-tools-integration

i18n tools integration
Change wording in peer waiting message to handle peer-only configuration
Merge pull request #412 from edx/will/TIM-628

Change wording in peer waiting message to handle peer-only configuration
Adding DB to authors file.
Merge pull request #414 from edx/sanchez/add-db

Adding DB to authors file.