ExternalConfigServer is a replacement for WSGITileServer that uses external
configuration fetched via HTTP to service all config requests.
 
Example usage, with gunicorn (http://gunicorn.org):
 
  gunicorn --bind localhost:8888 "TileStache.Goodies.ExternalConfigServer:WSGIServer(url)"

Modules
		TileStache logging

Classes
		TileStache.WSGITileServer WSGIServer DynamicLayers ExternalConfiguration   class DynamicLayers       Methods defined here: __contains__(self, key) __getitem__(self, key) __init__(self, config, url_root, cache_responses, dirpath) items(self) keys(self) parse_layer(self, layer_json)   class ExternalConfiguration       Methods defined here: __init__(self, url_root, cache_dict, cache_responses, dirpath)   class WSGIServer(TileStache.WSGITileServer)     Wrap WSGI application, passing it a custom configuration.   The WSGI application is an instance of TileStache:WSGITileServer.   This method is initiated with a url_root that contains the scheme, host, port and path that must prefix the API calls on our local server.  Any valid http or https urls should work.   The cache_responses parameter tells TileStache to cache all responses from the configuration server.     Methods defined here: __call__(self, environ, start_response) __init__(self, url_root, cache_responses=True, debug_level='DEBUG')