This causes a problem when you run `--skip-tags deploy`

fix mode for verified user

Setting this to !!null will not work, submitted a bug against ansible so
hopefully this can be resolved.

https://github.com/ansible/ansible/issues/4812

Until then I will fix edx-platform as a work-around to not
use an empty string as an import

fixing default for THEME_NAME

If THEME_NAME is set to an empty string it will cause a sass error due
to this mako code:

```
% if env.get('THEME_NAME') is not None:
  // import theme's Sass overrides
  @import '${env.get('THEME_NAME')}';
% endif
```

Feanil/default emails

fixing discern settings for discern_celery

edxapp-extra-vars: Expose extra variables for configuration of the edxapp role

this adds some sample users using the new create_user django-admin.py

command

fixing directory perms for discern

Stanford datadog playbook updates

fixing handler name

Jarv/discern supervisor

Some general cleanup of the edxapp role, adding certs to continuous integration

Move xserver to supervisor

Fixes for edxapp: Permissions & supervisor startup/configuration

`supervisorctl reload` not only reloads the configuration files, but
also restarts all services, which causes all services to be reloaded
several times, and causes errors when the playbook later attempts to
start the services after changes have been applied.