secure-cookies: Allow to use secure HTTPS cookies (Django setting)

Cf https://docs.djangoproject.com/en/1.4/ref/settings/#std:setting-SESSION_COOKIE_SECURE
Make sure temporary course directory uses safe characters.
Update donation text in email and receipt page
Use UglifyJS to minify JavaScript in the LMS
Add LMS Performance tests (TNL-484).
Removed XML information from Researchers Guide and added files to OLX

removed old comment
Merge pull request #5513 from edx/markhoeber-remove-xml-tutorial

Removed XML information from Researchers Guide
Only permit ascii characters in filenames generated from course_ids.
Merge pull request #5521 from edx/will/minify-js

Use UglifyJS to minify JavaScript in the LMS
Fix typo in #5392 (encodeURICoponont)
Add the ability for Microsites to be able to send appropriately branded emails rather than the default system installed version

fix tests. Update Admin views/forms.

enforce uniqueness constraint in the Admin ModelForm submissions

Update bok_choy cached DBs with new schema changes

PR feedback
Fix unicode-related failures in CSV upload.

TNL-586
Sort course and enrollment pairs on dashboard
Merge pull request #5524 from edx/dan-f/fix-student-profile-csv-unicode-2

Fix unicode-related failures in CSV upload.
Merge pull request #5520 from edx/will/update-donation-text

Update donation text in email and receipt page
Merge pull request #5503 from edx/diana/reorder-dashboard-courses

Sort course and enrollment pairs on dashboard
Don't show cohort information when disabled

TNL-552
Address code review comments
Minor cleanups
Adding new styles to the new donation button.