Class edit minor interface tweaks
Hide class cancel button if class is already cancelled.

We’re not going to allow un-archive for classes since this would have a
lot of implications for scheduled students.  The confirm popover should
be enough—don’t cancel the class unless you really mean to.
Added the ability to archive from a modal
Added transition & delay to change/add class day

It was really annoying having the day highlight happen immediately,
added a 300ms delay so that it wasn’t so obtrusive on the modal class
calendar view.
Updated backlog to work again, still needs some TLC
Minor home page CSS tweaks
Corrected some selectize CSS references

We were pointing to the wrong CSS file which was causing some strange
artifacts and color choices
Housekeeping
Minor upper right button fixes for tooltips
Moved jade code back into scheduled view

Since we’ve gone different directions with the two view now,  moving
all the shared code back into the scheduled.jade file, will remove the
mixin later on.
Fixed strange start date inconsistencies