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Auto-zoom a map using a coffee script class
Provided an App.GoogleMap coffee script class with the google.maps.Map stored as map and the google.maps.Markers stored as markers, the map can be auto-zoomed, i.e. adjusted that all markers are visible.
# app/assets/javascripts/google_maps.js.coffee
# ...
class App.GoogleMap
# ...
bounds: {}
constructor: (map_div)->
# ...
@auto_zoom()
auto_zoom: ->
@init_bounds()
# TODO: Maybe, adjust the zoom to have a maximum or
# minimum zoom level, here.
init_bounds: ->
@bounds = new google.maps.LatLngBounds()
for marker in @markers
@bounds.extend marker.position
@map.fitBounds @bounds