Initial commit for #1671 display visits for new exam objects

  - In-video quizzes are included under the quizzes list
closes #2332.  raises event when repopulating textbox
Merge pull request #2333 from Stanford-Online/jbau-graded-exam-repop-event

closes #2332.  raises event when repopulating textbox
initial commit for adding members
sending email
inviting single email addresses done
adding users via CSV -> celery task
include username in existing user invite email
added preenroll_only functionality
differentiated statement buttons and progress on profile page
cleaned up body.css file for profile page
added python engineer job post with disabled link
fixed some english whoopsies
change python job description a bit (#2341)
class member promote/demote
NO-OP change to retry travis (tests pass locally)
regrader print record id's (#2344)

useful for forensics later
Merge pull request #2342 from Stanford-Online/giulio-hiring-page

Added python engineer job post with disabled link
192 char email field -> 128 char
fixes #1931.  Comments in code document why