BOA test with all the features requested

[pratikbhatia199]

Requested changes

1. A customer can transfer between their accounts
2. Change Maxi-Savings accounts to have an interest rate of 5% assuming no withdrawals in the past 10 days otherwise 0.1%
3. Interest rates should accrue daily (incl. weekends), rates above are per-annum

Additional changes:

1. Bank can have account of customer with unique name, done because it becomes O(1) operation to retrieve customer by name
2. Customer has unique accounts, done because accounts of same type are not really needed. It also becomes O(1) operation to retrieve account of a given type.

Note: Could've added test cases for account but I don't know Nose really well.
Update: I added the test cases after a break to think clearly, took only half hour.

Thanks for giving me the opportunity to interview, this was a really fun activity, I hope to hear from you soon!