Fix 1093106 and 1093120 - Fixes for browse app of test data

This PR fixes two bugs:

[1093106](https://bugzilla.mozilla.org/show_bug.cgi?id=1093106) - Add feature relations to browse feature detail
[1093120](https://bugzilla.mozilla.org/show_bug.cgi?id=1093120) - Escape HTML in feature names

This builds on commits in PR #14.  You may want to review those PRs first.