coupon code reminder changes as discussed with aman sir,and sms functionality change.

Store the sms number in database.-Done
create a field in the database table in the gifts table for storing the
sms number.
ALTER TABLE `gifts` ADD `sms_number` VARCHAR( 255 ) NOT NULL DEFAULT '0'
AFTER `sms`
Implement all the changes  as discussed with aman sir.for code expire
for both free and paid gift code.