Removed grading and drag'n'drop

Bug/djpyfs

doc-byte-sized-tasks: Add link to the byte-sized tasks in CONTRIBUTING

Split/lms bugs

Thanks to @adampalay, we now have a list of byte-sized tasks, which are
useful for new contributors who want a gentle introduction to the
platform. This PR adds a link to the tasks tagged as byte-sized in the
public tracker.

Pin coffee-script version to 1.6.1.

1.6.3 is causing some issues.

Update test_group_configuration_validation on single group allowed

Make sure that the currently-set language is the one that shows on the left sidebar if no language  preference exists.

Enable Bok Choy split test.

LMS-11260

to generate url.
LMS-11209

Update opaque-keys library to use block_id for html_id for new keys.

Catch more places where get_children was giving us version aware references.
LMS-11237

one that shows on the left sidebar if no language
preference exists.

ECOM-135

Revert "Update opaque-keys library to use block_id for html_id for new k...

Adds pyfilesystem service from XBlocks to edx-platform

Update opaque-keys library to use block_id for html_id for new keys.

Catch more places where get_children was giving us version aware references.
LMS-11237

Update activation email text

Fix check and show answer for split

Updating the footer for edx.org and open edx.

Update to latest XBlock

Make it more active.  Adds a separate section for edX.org-specific copy,
because it's hard to make it generic.

LMS-11084

Remove JavaScript variables from global namespace

Move the open edx logo inside the div

Adding a bunch of placeholder views.

indenting.

Making some styles work against LMS sass.

Adding back the old edx footer and associated icons, with a feature flag.

Split get_block uses the passed in id rather than constructed

on returned block so that branch/version awareness is inherited.
LMS-11263

LMS-11237

Refactored expected indices after email w/ mongo