Implement scrolling behavior for projects list nav.

Review Request #7587 — Created Aug. 14, 2015 and submitted — Latest diff uploaded

Information

student-sonar
master
2890846...

Reviewers

When scrolling the main body of the projects list, it's nice to also scroll the
nav to show the highlighted item. This implements that.

Scrolled around with a variety of window sizes and scroll positions. Saw that
everything worked as expected.