Location and entry maps

used MapBox Api to generate map on location show page.  
--map displays marker for each entry near the map center.
--javascript is in the html file.  I was having trouble getting the ruby variables to work in a seperate js.erb file.  Help would be appreciated.
I doubt that would be an issue, beware of premature optimization.

That being said, a better solution to that would be to memoize the result in the method itself.

For example:

```ruby

def coordinate_area
  @coordinate_area ||= build_coordinate_area
end

def build_coordinate_area
    # what you currently have in `area_object`
end