Interrim psychometrics with real-time IRT plots and histograms (see note)

Ike is committing to implement the SOA API which discussed in person, in which a separate djangoapp would receive the tracking logs from the LMS, and also be queried by the LMS to perform psychometrics analyses.  Initially this psychometrics djangoapp might share some tables like StudentModule with the LMS, but the plan would be to separate them when possible.  

Ike will implement this for edX by November.

value of max_grade (something not right about StudentModule.max_grade)

Feature/victor/proper 404s

don't break courseware if S3 is unreachable

also show pid in migration and instructor dashboard views for thread debugging

missed instance of login link which should have been behind DISABLE_LOGIN_BUTTON

Set the course static file dir to /static directories in course repos if...

quick wording change

don't show empty list if there is no error data

This reverts commit 3e1bac48, reversing
changes made to 4f680ee0.

A bunch of bug fixes for IE8 and change in the styling of the login and sign up labels

Change form style for login and signup modals so it is consistant in every browser and we have no usability problems

Feature/ibrahim/discussion distinguish instructors

Feature/victor/save course position

cktsim-in-schematic