Merge remote-tracking branch 'origin/master' into 58354376-make-colors-better

Conflicts:
	styles/variables.less
	styles/workspace/sidebar.less
Merge pull request #54 from oerpub/58354376-make-colors-better

use colors from mock-up
Merge pull request #52 from oerpub/57874740

make editor panel not disappear on small monitors
Merge pull request #59 from oerpub/no-cutoff-menus

Don't cut off the heading/table menus. --
Merge pull request #46 from oerpub/copy-paste-always-visible

Copy and paste is always visible.
Merge pull request #57 from oerpub/58354912

change copy in 'add' menu of ToC
Merge pull request #55 from oerpub/remove-rounded-corners

removed rounded corners from boxes
Merge pull request #56 from oerpub/58037148

rip out tooltips on sidebar edit buttons
further color changes

I changed the green/teal/orange slightly from the mock-ups, since they
were looking off on some monitors. Hopefully this is better. This also
has further color changes, mostly related to tree highlighting.
Merge branch 'refs/heads/color-refactor' into testing

Conflicts:
	scripts/gh-book/gh-book.less
	styles/variables.less
	templates/workspace/sidebar/toc-branch.html