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 #13.  You may want to review those PRs first.
This worked after a browser refresh.  Everything under /browse is a single-page app, so maybe it was running an old version of the handlebar template.  Maybe.