add press release: edX expands internationally

Press/international

Feature/vik/check if submission allowed

Conflicts:
	common/lib/xmodule/xmodule/open_ended_grading_classes/combined_open_ended_modulev1.py

studio - fixed alignment of new section field and controls

Fix test so we don't have to skip it anymore.

Press/international

- Dan sent out a press release with those urls.
- Using a redirect instead of making it case-insensitive
  because the proper urls are prettier

Feature/vik/disable spell check

Support due dates for Peer Grading XModule

Merge branch 'feature/diana/close-oe-problems' of github.com:MITx/mitx into feature/diana/close-oe-problems

Conflicts:
	common/lib/xmodule/xmodule/open_ended_grading_classes/combined_open_ended_modulev1.py
	common/lib/xmodule/xmodule/peer_grading_module.py

Feature/vik/settings to xmodule

Adding in Studio Page headers and actions + help text

Refactor lettuce tests to move common stuff out of lms and cms and into common

- removed duplicate logos.
- cover images are still in the 200-350 KB range.

Comment out tests that don't run correctly without prerequisites.

Conflicts:
	lms/templates/instructor/staff_grading.html

Fix error message provided by Instructor dashboard datadump - make it more useful