add doc strings; fix pep8 warning
address some minor issues brought up by the code review process

Final official name is Custom Courses for EdX (CCX), rename all code to remove previous name.

Rename the FEATURE constant used to identify this feature

Rename the middleware for the CCX change

rename the constant used for storing the current poc id on the session.

rename the _PocContext threading local

rename the override provider in all places where it is referenced

`PersonalOnlineCoursesOverrideProvider` -> `CustomCoursesForEdxOverrideProvider`

generally rename symbols from overrides.py to replace `poc` with `ccx` where possible without changing model names or attributes

rename more symbols from poc to ccx
rename util functions from app utils module

general symbol renaming poc -> ccx in views.py and related url changes

Rename the coach role wherever it is used.

reword poc_coach to ccx_coach

UI rename

replace POC with CCX globally

template context variable renamed

rename poc_ to ccx_ in urls and all related locations (views, js, scss etc)

remove pocs migrations

Final massive renaming, including models.  Re-built migration.

cleaning up a few tailing references

Fix reference typo in schedule template JS

undo modifications made on the fly in test setup to ensure that our tests are properly isolated from the rest of the system tests.

Fixes jazkarta/edx-platform#38

Clean up some leftover strings and comments

fixing more strings and comments in python files

fix a naming error in the schedule tab that was causing problems in deleting courseware items.

Fixes jazkarta/edx-platform#36

updating tests and utility code to match changes in infrastructure from latest rebase

This feature provides the ability to designate a "coach" who can create customized runs of an existing course, invite students to participate, and manage students through the run of the course.

In this squashed commit we implement the initial scifi, add the 'POC Coach' course role, refine the scifi, add migrations for models, create POCs, enforce POC Coach role, provide panels for Coach Dashboard, set up rudimentary display of course outline, add and remove units, show/hide all units, and save schedule changes, set dates when adding units, edit dates on units already added and provide some tests.

We also provide mechanisms for invitation and enrollment in a POC (to become CCX) and control the display of blocks to students in a POC.

individual students, and a reimplementation of the individual due date
feature.

This work introduces an architecture, used with the 'authored_data'
portion of LmsFieldData, which allows arbitrary field overrides to be
made for fields that are part of the course content or settings (Mongo
data).  The basic architecture is extensible by means of writing and
configuring arbitrary field override providers.

One concrete implementation of a field override provider is provided
which allows for overrides to be for individual students.  This provider
is then used as a basis for reimplementing the individual due date
extensions feature as a proof of concept for the design.

One can imagine writing override providers that provide overrides based
on a student's membership in a cohort or other similar idea.  This work
is being done, in fact, to pave the way for the Personal Online Courses
feature being developed by MIT, which will use an override provider very
much long those lines.

As some i18n features need ```ugettext``` or its shorcut ```_``` to be called on a non-string-literal, so the pylint check of ```translation-of-non-string``` should be explicitly disabled in such situations.

TNL-1256

TNL-1258

Move `Cohorts` section after `Membership` section

TNL-1268

TNL-1493

See https://openedx.atlassian.net/wiki/display/TNL/User+API for details

Allow global staff to generate example certificates
on the instructor dashboard.

Allow global staff to enable/disable self-generated
certificates for a course.

Conflicts:
	lms/djangoapps/courseware/courses.py
	lms/djangoapps/instructor_task/api.py

refined entrance exam student attempts reset

Quality improvements 1/16

added rescore, delete state and task history functionality

added unit tests for entrance exam reset attempts

added unit tests for re scoring of entrance exam and task history

improved test coverage

Got rid of pep violation

feedback changes and added jasmine test

added more jasmine tests for Javascript changes

added bok-choy tests for UI changes

replaced input containing <p> tags with <label>

Removed ee element assertions to avoid js error

Added call to super.setUp()

changes based on feedback on 2/18

Writing tests in JS instead of coffee script

commit related to skip entrance exam 2/13

fixed bad-continuation quality error

fixed broken bok-choy test

changes based on feedback on 2/18

added js tests and removed coffee script tests

fixed broken bok-choy and unit tests

changes left while rebasing

rephrase test titles

do not need these libs

changes based on feedback on 2/24

changes text which was left

Changes based on feedback on 3/3

Conflicts:
	lms/djangoapps/courseware/courses.py
	lms/djangoapps/instructor_task/api.py

refined entrance exam student attempts reset
added rescore, delete state and task history functionality

ECOM-891: Allow tracking of invoice transactions.

Authors: Awais Qureshi and Aamir Khan

These were found by the new pylint checker I wrote! :)

Makes logistration available at /login and /register as well as /accounts/login/ and /accounts/register/. In addition:

- Adds support for redirect URLs in third party auth for combined login/registration page
- Adds support for external auth on the combined login/registration page
- Removes old login and registration acceptance tests
- Adds deprecation warnings to old login and register views
- Moves third party auth util to student_account
- Adds exception for microsites (theming)

updated the failed unit test case and removed the unnessary import

Enrollment, unenrollment and beta role emails should be rendered in the
student's language, and not the instructor's language.

Added receipts_pdf.py

Used Paragraph for displaying a large body of text.

added the table

Line breaks in the para text. font size adjusted.

Improved the main table (alignments) and totals (converted to a table as well)

Converted the footer into a table, and allowed for pagination.

Added pagination to item data table.

Handled wrapping of long descriptions into multiple lines.

email attachment for both invoice and receipt

added the currency from the settings

Removed magic numeric literals and added meaningful variables.

Added initial set of substitutions from configuration

add defining logo paths via configuration

Removed font dependencies. Will use the system default fonts which appear good enough to me.

Alignment adjustments as per suggestions.

Fixed the pep8 violations. Added comments to styling

added the decimal points to the price values

Cleanup. Docstrings.

i18n the text in the pdf file

fix pep8/pylint issues

Changed the amounts from string to float.

Overrode the 'pdf_receipt_display_name' property in the OrderItem subclass Donation.

used the PaidCourseRegistration instead of the parent OrderItem to avoid course_id related exceptions.

quality fixes

added  the test cases for the pdf

made the changes in the pdf suggested by griff

updated the pdf tests to assert the pdf content

used the pdfminor library

fix quality issues

made the changes suggested by Will

added the text file that says "pdf file not available. please contact support"
 in case pdf fails to attach in the email

Update the redeem code schema

Updating the redeem code schema.

Adding migration file.

Adding course mode support when redeeming a code.

Conflicts:
	lms/djangoapps/shoppingcart/views.py

Add sales admin privileges for redeem code generation.

Making sure redeem code URLs work for verified courses.

pep8 violations

Code Review and Test Cleanup changes

Added tests, fixed tests.

Updating the boolean checks in ecommerce template

added the functionality of adding the expiration date, and also handled in the shopping cart when the user try to add the expired coupon code in the shopping cart

added expiration date in the coupons list in the ecommerce page

added the unit tests and jasmine tests

fix the quality issues and rebased with master

regenerated the migration file with a different number

i18n and verified te course mode

changes suggested by  stephan

WL-168 When redeeming a Registration Code in the shopping cart, the user should be redirect to the Registration Code Redemption page

improvements suggested by william

PLAT-280

PLAT-221

The variable name --- `dist` error
`dist` = {}  will cover `dist = grades.answer_distributions(course.id)`

[PLAT-217]

Move lms.lib.xblock into lms.djangoapps.lms_xblock in preparation add database backed configuration to it

TNL-735