Added function coupon_area_cid to add coupon IDs to the coupon_area.csv file. Modified coupon_attributes function to include all small area names / pref names for a coupon from coupon_area file. In coupon_detail, every coupon only has 1 pref / small area name.
Added function coupon_area_cid to add coupon IDs to the coupon_area.csv file. Modified coupon_attributes function to include all small area names / pref names for a coupon from coupon_area file. In coupon_detail, every coupon only has 1 pref / small area name.

Cleaned up coupon attributes function to make it 100x faster (bad initial implementation)

DataCentric1/ponpare