Set maxZoom property on both maps.

Fixes issue where map can be zoomed so close that side streets, etc. are cropped out of view.

This was a problem when the search results maps had only one marker, like this:
http://ohana-web-search-demo.herokuapp.com/locations?utf8=%E2%9C%93&keyword=san+mateo+example+location&location=

I set it on the detail map for consistency, although I couldn't find a case where that map started out zoomed in too close.