Users can search for specific hotels

@jsteiner, @gabebw

Finally! Thanks to you guys of course.
`hotel_reader.rb` already requires `hotel`, so you should either have it here OR in `hotel_reader.rb`. It won't break anything, but it's good to be aware of what is requiring what.

I think it's a good idea to require everything in the "main" file that you run at the command line, so this is a good place for it. I'd remove it from `hotel_reader.rb`.