fixup! Unit and integration tests of content libraries
fixup! Move code that uses the modulestore to an XBlock service
fixup! Library Content XModule
fixup! Refresh children automatically when library setting is changed
fixup! Unit and integration tests of content libraries
fixup! Library Content XModule
Display the library key on the library view in Studio
Remove state summary from the unit author page until SOL-192
Made empty course url the 'home' url instead.
Added subheader to content libraries page.
Fixed header display
Added test for /home/ redirect.
Quality check and test fixes.
Libraries UI: remove underline on hover.

This changes the style of the inactive libraries/courses tab when hovering.

Only the active tab on the dashboard page gets the blue underline.
When hovering over an inactive tab, the color of the text changes,
but the underline does not appear.
Update text on new content library form.
Update tests.

Most of the updates are related to the My Courses -> Studio Home change.