Add RESIZE=yes param to shapefiles export

Add the parameter `RESIZE=yes` to gdal shapefile driver. This resizes
fields to their optimal size. See
http://www.gdal.org/drv_shapefile.html for details.

This is needed because some customers are having trouble exporting
shapefiles, then reimporting into ArcGIS.

app/models/formats/ogr.js

@@ -145,6 +145,7 @@ OgrFormat.prototype.toOGR = function(options, out_format, out_filename, callback
 
       var ogrargs = [
         '-f', out_format,
+        '-lco', 'RESIZE=YES',
         '-lco', 'ENCODING=UTF-8',
         '-lco', 'LINEFORMAT=CRLF',
         out_filename,