Restore part of 85f04a that was reverted.

This appears to be a problem with any document with images. @render() is called
multiple times, and you have to clean up and re-initialise Aloha after
every render. Strictly speaking it would be better to set the content
of the editor rather than rerender the whole thing, but we'll fight that dragon
some other day.
copy change in bookshelf sidebar
Merge pull request #6 from oerpub/63306960-other-shelves-change-shelf

copy change in bookshelf sidebar
Merge pull request #1 from oerpub/63207788-fix-images-tables-p2

Restore part of 85f04a (in github-bookeditor) that was reverted.
remove octokit
Merge remote-tracking branch 'origin/master' into assorted-fixes-episode01

Conflicts:
	scripts/views/workspace/content/aloha-edit.coffee