CLC-4478 - Official Sections: As an Instructor, I want to be able to edit official sections

Contains changes related to:

CLC-4525 - Official Sections: Refactor business logic shared between LTI tools
https://jira.ets.berkeley.edu/jira/browse/CLC-4525

CLC-4526 - Official Sections: Create Course Info API end-point
https://jira.ets.berkeley.edu/jira/browse/CLC-4526

CLC-4534 - Official Sections: Add course info option to course provisioning data feed
https://jira.ets.berkeley.edu/jira/browse/CLC-4534
@redconfetti can we change this to something like this:

```javascript
$scope.tabs[tabName] = (tabName === requestedTabName)
```

Not sure whether we need the double `!` ==> `!!(tabName === requestedTabName)`