Fix doc API references
Clarify difference between TrainingExample and Assessment; add worker version to workflows
Merge pull request #322 from edx/will/ai-grading-revisions-2

More AI grading arch revisions
Merge pull request #324 from edx/will/fix-doc-references

Fix doc API references
Serialize course ID to unicode to correctly handle opaque keys
Merge pull request #327 from edx/will/opaque-keys-fixup

Serialize course ID to unicode to correctly handle opaque keys
Merge pull request #328 from gradyward/gradyward/fix-bpython

Changed the version of bpython to reflect the current version
Use settings for AWS credentials when connecting to S3, if provided
Merge pull request #329 from edx/will/data-dump-uses-settings-creds

Use settings for AWS credentials when connecting to S3, if provided
Handle opaque keys in a backwards-compatible way
Merge pull request #330 from edx/will/opaque-keys

Handle opaque keys in a backwards-compatible way
Remove distinction between recoverable/non-recoverable errors in the AI architecture doc
Install and configure Celery.
Merge pull request #332 from edx/will/celery-config

Install and configure Celery.
Adding the ability to review a single student as staff
Adding hooks to new user lookup service.
Merge pull request #325 from edx/sanchez/TIM-243-Instructor-Student-Overview

Adding the ability to review a single student as staff
Implement public API and data model for student training assessment
Merge pull request #323 from edx/will/student-training-def

Student Training (API and data model)
Added XML handling for student training