Update docs to reflect new modules that have been added.
Add outline for overall Workflow plan to docs for review.

TIM-493
Merge pull request #294 from edx/ormsbee/workflow_plan

Workflow plan
Use Django 1.4.x
Merge pull request #296 from edx/ned/django-1-4-11

Use Django 1.4.x
Continue showing peer assessment step as completed after the deadline passes
Allow continued grading after the deadline passes.
Merge pull request #297 from edx/will/TIM-487

TIM-487
Implement feedback per criterion (XML, backend, JavaScript, and templates)
Remove unused start/due date args in xml parsing
Use textarea attribute to limit submission/feedback text length instead of JavaScript checks.
Server truncates submissions/feedback that are too long instead of raising an exception.
Refactor peer step JS into its own source file.
Move JS namespace and gettext stub into a shared file.
Add scrollTo for turbo grade submission.