expand gitignore
add license file
add requirements file
add Makefile
init coupons app
add test runner
add settings module
add Coupon model
add code settings
add generate_code classmethod
add test for generate_code
add CouponManager
add CouponManager tests
auto generate code if coupon is saved without code
add test for save method
add south migration
fix copy&paste typo
add CouponAdmin