Add enrollment term to course autocomplete

Test Plan:
  * Search under Find a Course on any Managed Accounts page
  * Search for a course in Import Content (Copy a Canvas Course)

The autocomplete drop-down should show course name and its term.
Improve course autocomplete customization

* Update spec to test for enrollment term subtitle in autocomplete
* Detect presense of autocomplete before customizing _renderItem
Improve course autocomplete customization (Part 2)

Update content migrations Selenium spec to test for enrollment term
subtitle in autocomplete.
Initialize course autocomplete within the bundle

Remove the original autocomplete behavior, in favor of this more robust
approach of initializing everything in one place.
Add aria-label to course autocomplete
Merge pull request #421 from sfu/feature-course_autocomplete

Add enrollment term to course autocomplete