Add rspec-activemodel-mocks to Gemfile
Return no entries when there's no search term
Highlight search terms after formatting

This makes it so that we don't need to skip sanitation.
Don't prefix date day with a zero
Style highlighted words to be brownish
Make search case insensitive
Use one GET route for search

This is nice because we can bookmark a search, always see the search
bar, and don't need to press back to search for something else.