added config folder to gitignore to prevent it to be tracked by git.
modified variables method of Voucher model to fetch limit details as
well if available.
added database migration & model for direcpay payment gateway.
added routes & views for direcpay payment gateway
replaced old flash method with notifySuccess/notifyError methods.
added variables method to provide variables to be parsed for coupon
printing.
added hidden field to the printing form to be identified as
prepaid_vouchers
added missing destination route and hidden field to the printing form
to be identified as refill_coupons
added switch to determine prepaid vouchers/refill coupons and fetch
data variables from appropriate tables.