remove unpaid_ids and tests from debts
remove all other mentions of unpaid_ids from app files
add id of user who owes to debt mode
change min password length to 4
rework front page to use divs instead of tables
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fix debt pages spec after delete
remove jquery toggle buttons
remove toggles.js
change main.js back to coffeescript
move bootstrap-overrides to scss
remove bootstrap and overrides
allow users to mark debts as paid