refactor search specs
add searching by debt amount
remove default scope from debt model, implement table sorting on front page
add order to user.debts_owed_to method
create most_recent_first scope, table sort now working
change @search to @owed_search to allow for display of debts user owes
order user.debts_they_owe by most_recent_first
filtering debts for both owed and owed tables works
add tests for sorting owes table on front page