Explicit action to begin turbo mode.
Merge pull request #472 from edx/sanchez/ORA-37-Explicit-Turbo-Mode

ORA-37 Explicit action to begin turbo mode.
Add locks and a default value for the migration that adds criterion_id to assessmentpart
Merge pull request #475 from edx/will/update-migration

Update migration to add criterion_id to AssessmentPart
Allow criteria with no options, just written feedback.
Merge pull request #463 from edx/will/0-option-criterion

Feedback-only criteria
Allowing file based submissions for ORA2
Merge pull request #464 from edx/sanchez/TIM-645-Image-Submissions

Allowing file based submissions for ORA2
Fixing error toggling for server-side errors.
Merge pull request #481 from edx/sanchez/better-image-submission-errors

Fixing error toggling for server-side errors.
Better handling of duplicate training essays
Merge pull request #484 from edx/sanchez/ORA-640-Disallow-Duplicate-Essays

Better handling of duplicate training essays
Update i18n translations
Use the read replica in the download data management command.
Merge pull request #488 from edx/will/data-download-uses-read-replica

Use the read replica in the download data management command.
Standardize build tools using make
Quiet the doc and i18n scripts
Add locale to i18n script
Use PhantomJS as the headless test runner.
Refactor file upload tests
Minify CSS
Merge pull request #493 from edx/will/minify-css

Minify CSS
Merge pull request #492 from edx/will/standardize-build-tools

WIP: Standardize build tools using make
Fixed Python-memcached from 1.53 ==> 1.48
This is to match the version in edx-platform