Add status reports to timeline.
Review Request #7912 — Created Jan. 26, 2016 and submitted
This makes some progress towards the timeline being a truly complete picture of
what students are doing by including their status reports in it.
Looked and saw a timeline that had review requests, code reviews, and status
reports all together.
Tool: PEP8 Style Checker Ignored Files: lib/frontend/user-detail-view.js css/style.less Tool: Pyflakes Ignored Files: lib/frontend/user-detail-view.js css/style.less