Merge pull request #4465 from edx/zoldak/fix-studio-clicks

Improve clicking and synchronization in Studio bok-choy tests
Make test_export_all_courses do not rely on the order in which files are returned by os.walk().
Disable failing test STUD-2003
Merge pull request #4546 from edx/zoldak/disable-test

Disable failing test STUD-2003
Merge pull request #4474 from Stanford-Online/sjang92/null_tabname_bugfix

Bugfix: New Tab name being initialized as null
Merge pull request #4543 from edx/tim/test_export_all_courses-was-flaky

Make test_export_all_courses not flaky
Merge pull request #4537 from cpennington/new-locator-key-prefixes

Use a version of opaque keys that identifies version numbers in the key prefixes
Unit test for import performance STUD-1994
decode uri component before redirect for safe redirect
add var declaration for next
check if next is not defined
Add a view that can show us what URL params we got
Add a more informative assert to a lettuce helper
A debug view for seeing the URL params
Add a test of login with params on the next URL
Fix the decoding of ?next=
Merge pull request #1 from edx/ned/add-test-to-4080

Ned/add test to 4080
Refactor studio tests to use StudioCourseTest
Fix is_browser_on_page method for Studio Container page
On import, don't move the course into the course_dir but just
do the import from wherever it unpacked.
Avoids an exception where the top-level dir had a subdir of same name
as one being moved, but also just makes it faster.