Initial view expenses panel
Added wicketeer dependency for typesafe property models.
Added table to view expenses panel
Added count and findAll to expenseService
An adapter implementation of Spring's Pageable and Wicket's IDataProvider
View expense panel now pulls data from the expense service
Rendering test for expense page
Added table of expenses to expense page
Fixed NPE when no sort is specified
Changed to a DefaultDatatable to get headers and pagination and information if there are no expenses.