browser: sort by score not votes

Use the 'score' sort for search rather than 'votes'
browser: bug #178 handle any undefined facets in search results

When processing search results that did not have matches, the server may respond without facetValues for some facets. In these cases, create an empty array of facetValues so that the algorithm for processing them does not fail.
browser: mark search bar on QnaDoc page as incomplete

QnaDoc page search bar is not functional, mark incomplete.