Adding django default log handlers into logging configuration
Add missing mimetypes for xblock resources
Add mimetype additions in studio startup
Encrypt the session id before writing to tracking logs.
Also use md5 for constructing key for hmac.
Update ddt to 0.8.0
Fixes BLD-1104
Extract i18n strings from *.underscore files using django-babel-underscore
Add additional tests for tracking of sessions.
Adding template tag to render the microsite favicon
Extract i18n strings from *.underscore files using django-babel-underscore

Change strings from mako.po into underscore.po, which is finally merged into djangojs.po.
Adding template tag to render microsite css_overrides_file
Merge pull request #3962 from edx/dcs/BLD-1104

Fixes BLD-1104
Merge pull request #3971 from louyihua/django-babel-underscore

Django babel underscore
extract from underscore files under cms, lms, and common

to avoid extracting from test_root and such
Don't search for underscore files under lms
Babel underscore extraction update according to @nedbat

1. Add underscore.po into the merge section in config.yaml
2. Using one babel command template to construct two babel commands
Merge pull request #3988 from louyihua/django-babel-underscore

Babel underscore extraction update according to @nedbat
Text Annotation Tool: Added Instructor Filter and Clear Search
Video Annotation Tool: Added Instructor Filter