Merge pull request #241 from stefanklug/extent

don't overwrite maximum-extent when specified in mml

lib/carto/renderer.js

@@ -188,11 +188,15 @@ carto.Renderer.prototype.render = function render(m, callback) {
     );
 
     var properties = _(map_properties).map(function(v) { return ' ' + v; }).join('');
+    if(!map_properties['maximum-extent']) {
+        properties += ' maximum-extent="-20037508.34,-20037508.34,20037508.34,20037508.34"';
+    }
+
     output.unshift(
         '<?xml version="1.0" ' +
         'encoding="utf-8"?>\n' +
         '<!DOCTYPE Map[]>\n' +
-        '<Map' + properties + ' maximum-extent="-20037508.34,-20037508.34,20037508.34,20037508.34">\n');
+        '<Map' + properties +'>\n');
     output.push('</Map>');
     return callback(null, output.join('\n'));
 };