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.
Add student training assessment information
Merge pull request #394 from edx/sylvia/docs/TIM-597

Add student training assessment information for course authors
Remove translation strings from assessment APIs
Updated logging in XBlock mixins
Added more verbose logging in assessment APIs
Cleaned up i18n strings in templates.
Add missing i18n strings
Add i18n to Travis build
Remove fake2 language, since we already have Esperanto
Merge pull request #408 from edx/will/i18n-strings-cleanup

i18n string cleanup