Improve quick search

[scj1091]

The quick search autocomplete box from the main nav isn't always friendly. For example, if you're searching for an involvement and the search returns no users or ministries, it still only shows 4 involvement results. We should tweak it so there's a total number of results returned dynamically divided evenly between the three categories. Also, if you don't find what you're looking for, most people have no idea they can press enter or click the search button to do a full search. Maybe we can add a note at the bottom of the results saying "If you didn't find what you're looking for, click here to do a full search."