Add withdraw specification.
Execute withdraw specification.
Implement withdraw feature.
Rework specs to be more explicit.
Remove withdrawal spec.
Replace Account#addTransaction by Account#deposit.
Get rid of TransactionBuilder.
Get rid of set/get methods from Account.
Get rid of AccountBuilder.
Get rid of get/set methods for Client.
Get rid of get/set methods for Transaction.
Rename Transaction#Action into Transaction#Type.
Get rid of get/set methods for Transactions.
Using a lambda expression to calculate Transaction#balance.
Fix typos in comments.
Create missing app package in 'src/specs/java'.
Rename Account#holder into Account#client.