fixes #60
Modified Month/Week Expenditure showing NULL instead of 0
Added expense in actual month (May)
Merge branch 'master' of https://github.com/PauloGandraSousa/EAPLI_2013_PL_2DI

Conflicts:
	eapli.ExpenseManager/src/eapli/expensemanager/repositories/hibernate/DBExpenseRepository.java