The interface for custom management commands changed in Django 1.8 which
caused the `compute_grades` command to stop working. In order to fix it
I added an `add_arguments` method for specifying the accepted arguments
and updated the command to allow for passing a list of courses to run
the `offline_grade_calculation` against.

This management command has been broken since before the django 1.8
upgrade, so I'm deleting it and all its tests, and updating a few
other files that used these methods but are easily refactored away.

- added the abstract and concrete layers of enrollment report provider
- created a celery task.
-added the button in the e-commerce reports section

added the enrollment data backend

added the payment data and start writing the test cases.

updated the code with the feedback suggestions and wrote some test cases.
- all the downloadable reports are now visible in the ecommerce download section.
Pending instructor tasks is also visible in the ecommerce section

added the fields in the user profile information
changed the report store configuration key
added the new http endpoint for financial reports to add more permissions for finance_admin to access.

fix quality issues

added test cases to check csv content data

rebased with master and resolved conflicts

changed the log messages

added the changes as per code clintonb suggestions during code review

updated the test cases for the finance_admin decorator

changes suggested by clinton.

Created and moved Table level filters to the Custom Manager for the CourseEnrollment model.

ecommerce.js file was loaded twice in the instructor_dashboard.js fixed the issues

added the registration code column in the csv

added the full gender in the csv file

Update data sources and add display name translations for the report columns

fix meta name

Make sure the reports section does not appear on non whitelabel courses

pylint fixes

expand out enumerated values

The existing pattern of using `override_settings(MODULESTORE=...)` prevented
us from having more than one layer of subclassing in modulestore tests.

In a structure like:

    @override_settings(MODULESTORE=store_a)
    class BaseTestCase(ModuleStoreTestCase):
        def setUp(self):
            # use store

    @override_settings(MODULESTORE=store_b)
    class ChildTestCase(BaseTestCase):
        def setUp(self):
            # use store

In this case, the store actions performed in `BaseTestCase` on behalf of
`ChildTestCase` would still use `store_a`, even though the `ChildTestCase`
had specified to use `store_b`. This is because the `override_settings`
decorator would be the innermost wrapper around the `BaseTestCase.setUp` method,
no matter what `ChildTestCase` does.

To remedy this, we move the call to `override_settings` into the
`ModuleStoreTestCase.setUp` method, and use a cleanup to remove the override.
Subclasses can just defined the `MODULESTORE` class attribute to specify which
modulestore to use _for the entire `setUp` chain_.

[PLAT-419]

Move modulestore config for tests to an importable location
Disable pylnt warning for lms imports in common tests
Refactor all testcases that loaded all xml courses
TE-610
TE-489

[LMS-2757]

This commit adds the non-courseware lms/djangoapps and lms/lib.

These keys are now objects with a limited interface, and the particular
internal representation is managed by the data storage layer (the
modulestore).

For the LMS, there should be no outward-facing changes to the system.
The keys are, for now, a change to internal representation only. For
Studio, the new serialized form of the keys is used in urls, to allow
for further migration in the future.

Co-Author: Andy Armstrong <andya@edx.org>
Co-Author: Christina Roberts <christina@edx.org>
Co-Author: David Baumgold <db@edx.org>
Co-Author: Diana Huang <dkh@edx.org>
Co-Author: Don Mitchell <dmitchell@edx.org>
Co-Author: Julia Hansbrough <julia@edx.org>
Co-Author: Nimisha Asthagiri <nasthagiri@edx.org>
Co-Author: Sarina Canelake <sarina@edx.org>

[LMS-2370]

The submission time is serialized into json and sent to xqueue. Previously the
whole json body argument to send_to_queue() was being matched. Sometimes the
time calculated in the test would differ slightly from the time calculated in
send_to_grader() and the test would fail. This fix tests individual fields of
the body argument to mock_send_to_queue() instead.

ORA-286

ORA-286