We updated the underlying methods to always be passing unicode strings
aronud and only encode them to bytes when we need to hash them.

Python 3 changed how rounding is performed. In Python 2, .625 rounded to
.63 (as our grading code rounds it, so the test passed).  In Python 3,
.625 rounds to .62.  This fixes the test by avoiding round() to
calculate the expected value, and instead simply using the value we
expect.

The django test client returns bytes, and many of our tests start using
it like a string. This was fine in python 2 but not in python3.

Update the tests around static_file code to use byte streams instead of
string streams for generating static content.  This is a fix to get
these tests passing on python 3.

BOM-485

BOM-483

Feanil/unpin pip tools

Adds config model to pass arguments to management command

BOM-486

This would enable simulate_publish management command to
fetch its arguments from config model.

PROD-548

Show Upgrade Deadline in Studio

This shows the verified upgrade deadline for the course, as a
read-only field.

DISCO-1345

BOM-422

Awais786/prod 692

BOM-438

SE-1553 conditionally run migration on CSMH Extended table

clean up toggle annotations and lint when running feature toggle report

Issue 851 seems to have been resolved and issue 8.5.2 while still open is
not occuring with the latest version of pip-tools.

Update edx-platform dependencies.