Add amortization code to Loan based on Josh's answer
Some changes to StatisticsTabulator for clarity
Run repeating payments before fees and interest, because we would want a repeating payment to a Loan to count towards the minimum payment
Have Transaction keep track of the running balance, this does pose problems for repeating payments though
Handle repeating payments in a different way, with just a description and an amount
Remove two redundant exception types
Merge branch 'master' of https://github.com/meyerkizner/COP3504
Rename to LoanTest and fix it to adapt to Loan changes
Cleanup of testing code to align it to conventions