fixing name of task in common

Will/vagrant devstack

Moved headless browser config into a separate role
Added localdev role
Configured login shell for edxapp and forum
Added host update for Studio preview (preview.localhost)
Use custom base box for devstack
Added troubleshooting section to README

Added login shell for Jenkins worker account

creates supervisor config in main.yml and calls update to restart

If you tell supervisorctl to update and a process autostarts
sometimes you will get ERROR (already started) if you immediately
ensure the process is started afterwards.

services if it changes
deploy tasks no longer stop the service and will notify the restart
if any task changes

E0d/notifier refactor

Jarv/add hostname to common

Jenkins worker refactor

Adds status checking and will add new or previously/accidentally removed
members to mongo clusters.