Exporting specified properties

When exporting a column containing an object reference like object.property
the export would contain empty values for that whole column because it
didn't interpret objects and their properties properly.  I modified the
init function where it iterated through each column and set the export data
to check and see if the property that was being exported contains a period.
If the export does in fact contain a period it will interpret that as an
object with a property.  It now treats anything before the period as the
object and anything after the period as the property.  This enables the
ability to export object.property columns properly.

Please see my plunkr for example:
http://plnkr.co/edit/0AAx6iVeXYHZDZt1WadS?p=preview