LEARNER-3769

Let's guard entitlement-creation support behind a waffle flag before
releasing it into the wild. So back it out now and we'll reintroduce
it after we have a flag.

When creating a new course in publisher, require type and price
up front rather than waiting until creating a course run.

LEARNER-3767

This fixes builds in travis. I specifically didn't change pylintrc
yet in this branch, to avoid having to fix all the new errors. But
I did make some of those  lint fixes anyway.

The line was originally put in to address failures in the Node 8
upgrade where the Node 6 version was getting cached, but caused other
problems in Travis where the process doesn't have the permissions to
create those directories. Hopefully no longer needed.

Update the image resolution and size we store in discovery for course
EDUCATOR-2041

LEARNER-3013

relativedelta(year=1) calculating the wrong date value "1-01-04 13:43:42"
with singular argument.

LEARNER-3801

Both the instruction copy and the error feedback copy are changed to better help user understand the image restrictions
EDUCATOR-1954

Course-discovery is returning incorrect availability status of the
courses that have 'null' value in their course_end date.To avoid it,
a conditional statement is modified so that it will behave as expected.

LEARNER-3218

The previous program field named instructors caused confusion as it
wasn't obvious that it was only to be used to help determine which
order to list instructors. Renaming it to instructor_ordering helps
minimize confusion and better explains it's purpose.

[WL-1343]

EDUCATOR-1954

EDUCATOR-1957

EDUCATOR-1953

EDCUATOR-676

This allows the program creator to determine the order of the instructors on the program marketing page.

We need a new name/path for the new image updated to these objects because cache would keep the old image alive all the time
LEARNER-3455