Also includes RequireJS changes.

Fixes bugs:
STUD-755, STUD-152, STUD-700, STUD-699

Add CSS classes and fix drop destination bug.

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