Added gradle dependencies.

[#55215004]
Fix tests, allow removal of current widget.

[#55215004]
Renamed additional to sidebar

[#55151742]
Merge commit '4dd758b03445c36e27517e54d88aed56e7fbddd9' into gh-pages

# By Jeff Taggart and Nick Street
# Via Jeff Taggart and Nick Street
* commit '4dd758b03445c36e27517e54d88aed56e7fbddd9':
  Renamed additional to sidebar
  Fix tests, allow removal of current widget.
  Added gradle dependencies.
Rename additional to sidebar