Add the menu, coin values, starting resources and message texts to
constants.py. Implement report, is_resource_sufficient, process_coins,
is_transaction_successful, make_coffee and the main loop. Money is
counted in whole cents. The smoke test now feeds "off" so the loop
exits.
Closes#6Closes#7Closes#8Closes#9Closes#10Closes#11Closes#12
Task: MIL-002#1
Task: MIL-002#2
Task: MIL-002#3
Task: MIL-002#4
Task: MIL-002#5
Task: MIL-002#6
Task: MIL-002#7