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
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
Merge pull request #5524 from edx/dan-f/fix-student-profile-csv-unicode-2

Fix unicode-related failures in CSV upload.
Use Backbone for student account and profile JS.

Validate student account and profile form fields. Use RequireJS for Jasmine tests of account and profile JS.
Merge pull request #5523 from edx/hotfix/2014-10-08

Hotfix for 2014-10-08
Merge pull request #5515 from edx/renzo/language-backbone

Use Backbone for student account and profile JS.
Merge pull request #5531 from edx/release

Merge Release
Merge pull request #4730 from edx-solutions/secure-cookies

secure-cookies: Allow to use secure HTTPS cookies (Django setting)
disable pycontracts except in development environments (PLAT-122)