This is a simple wrapper JavaScript library to provide a single interface for a
variety of third-party reverse geocoding services.

Additionally, you can specify multiple providers in a single request each of
which will be tried until one returns a successful response.

Like this:

	var doThisOnSuccess = function(rsp){
		var div = document.getElementById('output');
		div.innerHTML = rsp['provider'] + ' says you\'re in: ' + rsp['name'];
	};

	var doThisIfNot = function(rsp){
		var div = document.getElementById('output');          	
		div.innerHTML = rsp['message'];
	};

	var args = {
        	'providers' : [ 'flickr', 'google' ],
		'enable_logging' : true,
		'flickr_apikey' : 'YER_API_KEY',
	};

	var pt = {'lat' : lat, 'lon' : lon, 'zoom': 16};

	var geo = new info.aaronland.geo.ReverseGeocoder(args);
	geo.reverse_geocode(pt, doThisOnSuccess, doThisIfNot);

You can also not pass a list of 'providers' and have the package define its own
list based on the availability of client libraries and things like API keys. The
order of precedence for automagic 'provider' lists is:

	* Flickr

	* Google

Here's a complete example using the js-geolocation libary [1] to reverse geocode
the user's current location:

	var geoloc_doThisOnSuccess = function(lat, lon){
          
		var reversegeo_doThisOnSuccess = function(rsp){
			var div = document.getElementById('output');
			div.innerHTML = rsp['provider'] + ' says you\'re in: ' + rsp['name'] + ' w/ UUID ' + rsp['uuid'];
		};

		var reversegeo_doThisIfNot = function(rsp){
			var div = document.getElementById('output');          	
			div.innerHTML = rsp['message'];
		};

	        var reversegeo_args = {
			'enable_logging' : true,
			'flickr_apikey' : 'YER_API_KEY',
		};

		var pt = {'lat' : lat, 'lon' : lon, 'zoom': 16};

		var geo = new info.aaronland.geo.ReverseGeocoder(reversegeo_args);
		geo.reverse_geocode(pt, reversegeo_doThisOnSuccess, reversegeo_doThisIfNot);
	};

	var geoloc_doThisIfNot = function(err){
		alert('failed to determine user\'s location: ' + err);
	};

	var geoloc_args = {
		'enable_logging' : true,
	}

	var loc = new info.aaronland.geo.Location(geoloc_args);
	loc.findMyLocation(geoloc_doThisOnSuccess, geoloc_doThisIfNot);

That's pretty much all the interface will ever look like. As of this writing it
mostly works but it's also incomplete and there are probably bugs.

Currently supported providers are:

	* Flickr (http://github.com/straup/js-flickr-api/tree/master)

	* Google (http://code.google.com/apis/maps/documentation/v3)

Note that you will need to include the service-specific JavaScript libraries
yourself.

--

[1] http://github.com/straup/js-geolocation/tree/master