Implemented requirements as of 20140615

A. Implemented ### Additional Features
* A customer can transfer between their accounts
* Change **Maxi-Savings accounts** to have an interest rate of 5% assuming no withdrawals in the past 10 days otherwise 0.1%
* Interest rates should accrue daily (incl. weekends), rates above are per-annum.

B. Test added to cover all blocks of the target code.