Merge remote-tracking branch 'origin/rc' into release
Backported insights role
Revert "Install Heroku Toolbelt on notifier machines"

This reverts commit a4ad4adca4ac7955405d3bf83c1e5991986ed63d.
Merge pull request #13 from Stanford-Online/jbau/no-heroku-toolbelt

Revert "Install Heroku Toolbelt on notifier machines"
Merge pull request #12 from Stanford-Online/jbau/backport-insights-role

Backported insights role
Merge remote-tracking branch 'origin/master' into rc
changes for data pipeline/api/insights
add new sandbox sudoers config
ignore git apt repo errors