Learner-pathway-progress

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* Added waffle flag on the top of signals code.

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* Update signal to accept CourseLocator as course_key.

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* Add management command and signal to update learner pathway progress and membership.

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Added
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* entry point for app
* app_label in model

Changed
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* Plugin app configuration

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Fixed
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* Version in __init__.py

Changed
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* name of package in setup.py file

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Added
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* Basic skeleton of the app.
* LearnerPathwayMembership model.

Changed
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* main branch from `main` to `master`