LEARNER-717 Add Refresh Token Expiration time

When edx_clear_expired_tokens command will run it will clear
all refresh,access tokens and grants expired before 2 weeks.

Schedules: Add upsell to Course Update templates

Fix i18n for the page title in course tabs

Fix request to currency endpoint

ECOM-7387 - Add grade display to the programs dashboard

More Django 1.11 startup changes - remove django-nose and more.

Cale/move org query to resolver

Handle completion events

Update bookmarks and updates pages to be responsive.

Fix unicode error on financial assistance page.

If country name has special character str() raises unicode error.

LEARNER-2951

WL-1060 | Made the dashboard social sharing site aware.

Implement Entitlement Model for Course Centric Architecture

* Submit a completion when receiving a completion event from an XBlock.
* Handle legacy progress events.
* Convert handler to use a dispatch dict instead of an if-else chain.
* Extract masquerade checking from individual handlers.
* Gate submit_completion on waffle switch
* 404 on handler views when trying to submit completion without waffle
switch enabled.

OC-3087

Disallow calling submit_completion when waffle flag is disabled.

Add tests that trying to publish completion errors.

add reactjs for single support form

LEARNER-2804

Only convert price to local currency after document is ready

[LEARNER-1733]

Only send upgrade reminders to learners who are eligible to upgrade

Updating edx-enterprise requirement to 0.53.1.

Merge PR 16260 back into master with a fix for the course sock

set django version in paver args

https://github.com/edx/edx-enterprise/compare/0.53.0...0.53.1