adding admin view

Admin view will print out all report cards, indexed by anchor points
and should be easily navigable.
adding floating floating navigation for admin view
adding drop down status menu for teacher view
changing teacher view to use new selector

Stopped using $_SESSION variables strictly for storing SID. Now using
POST data on the teacher view.
modifying teacher view for better information
integrating changes to teacher view into admin view
including changelog in index for teachers
changing metric for completion estimate
excluding 'once graded, but no longer' items
adding total complete
standardizing views
Merge branch 'next'

Conflicts:
	index.php