Fix exception to support unicode (and print url_name).

Part of STUD-868
Support unicode in text field.

Part of STUD-868
Support non-ascii chars as arguments to format.

We've had errors in export related to non-ascii chars being passed to format. Proactively making these usages of format robut to non-ascii chars.

Part of STUD-868
removes references to specific edx email addresses (STUD-1069)
Add better messaging, turn off SSL verification when sending grade back.
Merge pull request #1987 from edx/oleg/fix_mock_lti_protocols

Fixes and improvement to LTI.
Hide staticpages preview on render
STUD-1071
Merge pull request #2018 from edx/christina/export-bug

Bug fixes related to unicode support in export workflow.
Merge pull request #2020 from edx/christina/export-bug2

Support non-ascii chars as arguments to format.
Disable tests due to flakiness.
Merge pull request #2036 from edx/adam/remove-@edx-emails

removes references to specific edx email addresses (STUD-1069)
Merge pull request #2054 from edx/anton/disable-js-unit-test

Disable js unit test due to flakiness.
a11y: manage focus appropriately for modals with iframes in IE (LMS-1539)
Merge pull request #1863 from edx/adam/ie-modal-fix

a11y: manage focus appropriately for modals with iframes in IE (LMS-1539...
update rewriteStaticLinks utility function(modifiy only relative urls)
STUD-674
fix tinymce popup size too small
STUD-674
add validation for grading types (allow only integers)
STUD-988
Merge pull request #2044 from zubair-arbi/zub/bugfix/std674-inserteditlink

update rewriteStaticLinks utility function(modifiy only relative urls) +...
Merge pull request #2048 from zubair-arbi/zub/bugfix/std1071-staticpagespreview

Hide staticpages preview on render
Merge pull request #2052 from zubair-arbi/zub/bugfix/std988-integergradingtypes

add validation for grading types (allow only integers)