[#46395453 #43716797] Added options for adding coupon background in active admin
[#46395453 #43716797] basic setup for adding coupons
[#46395453 #43716797] added code for creating coupon
[#46395453 #43716797] added code for coupon upload and adding barcode
[#46395453 #43716797] coupon creation completed
[#46395453 #43716797] added code for showing coupon view graph
[#46395453 #43716797] changed bar width and color
[#46395453] Updated the size of coupon background, added migration to add color code for coupon
[#46395453] Added coupons background and integrated color code with coupon preview
[#46395453] Added uuids and made design changes in Coupons
[#46395453] Added end date for coupons and fixed some design issues
[#46395453] Added barcode value field for coupons
[#46395453] changes for barcode preview
[#46395453] added css for barcode
[#46395453] changes for bar graph
[#46395453] added code for barccode image creation, coupon preview changes for index page
[#46395453] code for deleting coupon
Updated designs for coupons, changed callback