fix path to geo constants file

Author: etpinard

src/plots/geo/set_scale.js

@@ -11,7 +11,7 @@
 
 var d3 = require('d3');
 
-var clipPad = require('./constants/').clipPad;
+var clipPad = require('./constants').clipPad;
 
 function createGeoScale(geoLayout, graphSize) {
     var projLayout = geoLayout.projection,