Installed pry, created periods controller
Fixed category name in expense partial, added expense partial and table to period index
Changed year/month/day methods in expenses model, periods controller now responds to dates in params
Added select month/year form to monthly page, created default categories for user, deleted unused pages.
Added virtual attribute category_name to expenses
Installed jquery-ui gem and converted category dropdown to autocomplete
Styled category index and new pages, created edit category page
Created expense form partial, created edit expense page
Created group by category method and view