add general .is-hidden css rule to lms
Various fixes

* Use is-hidden class instead of using jQuery show/hide/toggle
* Style inline discussions correctly
* Add float to post actions
* Put content labels (pinned/reported/closed) on a separate line
* Other minor visual fixes
fixup! Various fixes
Add endorsement info for discussion responses
Hide actions when inline thread is collapsed
Reorder secondary actions
Update spec templates
Fix and add to endorsement tests
Re-add fixture element to spec helper
Fix various tests
Improve accessibility
Fix more Jasmine tests (and some bad naming)
Manage focus better
add jasmine coverage for post / author labels and user display