Wrap JSInput Python code in CDATA section

Add defininition of window.location.origin in both studio and LMS

Python code can commonly contain characters that are invalid XML, such
as '<' and '>'. This has proven to be a pain point for instructors
implementing custom Python grading functions for their JSInput problems
(see sample code below).

This change creates a more robust template from which to make
modifications.

```python
    # This is an XML syntax error, when not inside a CDATA section.
    if i < 0:
        print('negative')
```

Use clear and send_keys instead of action chains in page object methods

Refactor studio tests to use StudioCourseTest

removing syslog_addr

This is not currently being used in production and will not
be used moving forward since logs are remoted using splunk

Improve is_browser_on_page method for Studio Container page

Unit test for import performance STUD-1994

Use a version of opaque keys that identifies version numbers in the key prefixes

Make test_export_all_courses not flaky

Bugfix: New Tab name being initialized as null

Disable failing test STUD-2003

Improve clicking and synchronization in Studio bok-choy tests

Add support for theme translations and LANGUAGE_DICT override

Add "Correct or Past Due" option for showanswer

Group Configuration: create, edit, delete groups

Split/branch settings LMS-11056

In Studio, when the course administrator creates a new tab, its name was being
initialized as null in the mongo database. This caused students in LMS to get a
server error when trying to access the course page, since LMS was trying to
process the null tabname for translation, etc. Now tabname is initialized as
'Empty', which is how it was being done in the frontend.

STUD-2000

Make overriding branch settings thread-safe LMS-11125

Release notes for 7-23-2014

Getting draft split_test_module instances to import/export.

Added text about grade ranges and certificates