* updating vendor files
* updating class syntax (to new FA-based classes) for all UI elements
* correcting broken tests

This commit implements STUD-1490, allowing creation of components
on the container page. It also enables the delete and duplicate
buttons now that new content can be created that would benefit.

Note that it also creates shared functionality for adding components,
and refactors the unit page to use it too.

STUD-1531

Also add support for refreshing the modal on custom save

STUD-1531

Also add support for refreshing the modal on custom save

Add Studio client-side runtime notifications for saving/cancelling XBlock edits.

This bug affected unpublishing content (and would trigger an error
message in studio). The fix was to uncouple the rendering of the studio_view
of an xblock with the student_view, so that content that wasn't in
draft mode already wouldn't be modified by early rendering of the
studio_view.

[STUD-1316]

STUD-1241

adjusted unit_spec.js to reflect new HTML structure, and corrected screenreader label for delete button

visual styling changes to components and static pages in order to use updated icon button styling for duplicate and delete actions

STUD-1186

Also includes RequireJS changes.

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

cleaning up styles to use list-input, field, group, label, input, tip, etc standards. also opted to try out initial pass at hierarchy splitting of css classes on items that repeat (li, for example)

cleaned up styling, synced up partially to existing standards for forms, fonts, colors, etc; currently open select box issue on chrome

styled modes header, added inactive and active mode visibility as well as is-set mode styling. no js behavior in yet. adds overscoll fix for webkit