bug 1077879 - Add JS-enabled HTML generator

/view_feature/<feature_id> will call /api/v1/view_features/<feature_id>
and display the available data.  It resembles the MDN format, but is not
supposed to be identical.
fix bug 1077879 - Add link to browse app

On the browse detail page /browse/features/<feature_id> , add a
prominent link to the JS-enabled feature view