instructor_task: Distribute extra items among subtasks of last query.

Ahodges documentation lm sdash

Added warning about complex numbers to math expression input

When creating an instructor task total_num_items may change between the
time it and the number of subtasks is calculated and the time the
subtasks are actually queued (all of this cannot happen in one transaction).
In such a case the extra items are distributed among the subtasks of the
last query.

LMS-2090

More fully integrate and test ssl external auth in CMS

Use path.py instead of os.path

Add "Protein Builder" to "Additional Tools"

Caution! This is backwards incompatible

i18n/dummy.py cleanup

Add info to external graders chapter

Removed unused make_dummy.py
Made dummy.py executable

Removed extraneous title block that was replacing the breadcrumbs

Removed LANGUAGE from devstack settings

fixing layout/style of disabled register button

Add documentation for "multiple choice and numerical input" problems

Conflicts:
	common/lib/xmodule/xmodule/modulestore/xml.py

Took the changes that were on the release branch.

Allow new response pagination parameters to pass through thread model.

Add OG title and description to course about pages

Clean up strings in the ErrorModule

Pass component display name to Mako template

Add initial languages, ready for dark-launch

Fix find courses page title in bok choy test suite

JIRA: FOR-374