Added Test Modified fucntion totalExpenditure

Conflicts:
	PersonalBudgeting.Tests/RealLifeScenariosTests.cs

	PersonalBudgeting.Tests/bin/Debug/PersonalBudgeting.Tests.dll.VisualState.xml
	PersonalBudgeting.Tests/bin/Debug/TestResult.xml
	PersonalBudgeting.v12.suo