Removed CareerSight and Schoology links from main nav menu
Removed 'browser-based only' filter from activities page
Removed 'login with schoology' link
Removed semester field from class forms
Updated site banner
Removed 'create activity' option for non admins
Changed 'teacher' to 'facilitator' in site content/text
Navbar update: removed Models & Search, made Facilitator Guides available to teachers/facilitators
Style changes to #userlinks in page header
Merge branch 'selectmedia' of github.com:concord-consortium/rigse into selectmedia
Changed 'facilitator' to 'facilitators' where necessary