Implemented the model class for income.
ref #9
Added the test method to the model class income.
ref #9
Finished the implementation of persistence of the incomes.
ref #9
Added a bootstrapper example of incomes.
ref #9
Finished the controller to the incomes.
ref #9
Finished the implementation of income ui.
ref #9
Finished the tests in the income controller.
close #9
Merge branch 'feature/9' into develop

Conflicts:
	ExpenseManager/ConsoleView.csproj
	ExpenseManager/Persistence/IPersistenceFactory.cs