Added Expense scaffold, and changed some formatting for dollar amount to be displayed properly.
Added initial owing calculation for total expenses of the month. Also added debugging gem
Finished calculating what each person owes that month. Expenses page will show what each person owes
Creating expense now has a select field to choose user, and index shows the users name for the expense
Finances functionality now works. Need to wait for user authentication to do anymore improvements. Styling can come later.

Merge branch 'finances'