Global Settings change, rich text editing

Replaced self guided tour deadline with evalution due after x days
field. Made short summary and long summary use tinyMCE and DragDrop.
Tour Guide access password

Added a tourguide password field to global settings. Will be used so
that tour guides can sign in and get student emails.

Also gave admins more ways to email students.
Tour guide access

Tour guides can login and view there trips/emails students.
Added tour guide to sidebar, handled some errors.
Switch between settings and add trip
Added global trip instructions
Promo page
Merge branch 'trip-improvements'