* Changed: Replaced woo_ce_save_csv_file_attachment() with generic woo_ce_save_file_attachment()
* Changed: Replaced woo_ce_save_csv_file_guid() with generic woo_ce_save_file_guid()
* Changed: Replaced woo_ce_save_csv_file_details() with generic woo_ce_save_file_details()
* Changed: Replaced woo_ce_update_csv_file_detail() with generic woo_ce_update_file_detail()
* Changed: Moved woo_ce_save_file_details() into common Plugin space
* Changed: Added third allow_empty property to custom get_option()
* Added: Disabled support for XML Export Format under Export Option
* Changed: Created new functions-csv.php file
* Changed: Moved woo_ce_generate_csv_filename() to functions-csv.php
* Changed: Moved woo_ce_generate_csv_header() to functions-csv.php

git-svn-id: https://plugins.svn.wordpress.org/woocommerce-exporter/trunk@913779 b8457f37-d9ea-0310-8a92-e5e31aec5664