Remove unused variables; some changes to match existing BDD spec for
drag/drop (expand-on-hover timeout and dropping with mouse outside of
element); bugfix for section expand; some code cleanup; update and
re-enable acceptance test.

Failed drags bring the element back to where it started; elements are
locked to the y-axis, states are represented as CSS classes for
styling, elements can be dragged across section/subsection borders,
and dragging to the top/bottom of a section Just Works™.

Needs some styling love to give visual representation of where the
dragged element will drop, though.

TODO: It'd be good to have auto expand/collapse for subsections.

base.js requires jquery.smoothScroll

Use pre-generated reports for pep8/pylint when running diff-quality

Update docs readme

Model tests for verify_student flow.

Jkarni/feature/import feedback

    And fixes for rebase-breakage.

disable buttons for legacy and beta instr dash

Fix navigation and grading acceptance tests

LMS: adds message styling to the separate instructor_2 Sass file

set max enrollment for downloads to 200

Studio: adds in instructional copy to user on when it is safe to leave the import view without harming an import process

Studio: revises import help/status copy to better reflect/generalize what is done with imported content

Add test cases for import status

Studio: revises general layout/styling of import view and adds in detail progress feedback after import (WIP)

Studio: removes import progress bar HTML and Sass; hides import status by default

Studio: revises import file upload success copy; sets up showing/hiding states for import status and additional messages

Studio: revises iconography and adds in success step in import status feedback

Studio: adds hidden styling back into import status UI

Hook up view

Fix getStatus function

Fixed grading tests

Captions are now removed from tab order when hidden

Use wrapped tar extraction

Bug fix - text_customization should not show in settings