Show all debts after a change is made
Clean up doc comments for debt.coffee
[FEATURE] User can show list only her own debts with 'gimli my debts'
Clean up message output since 'my debts' command was added
Introduces the concept of ignored users (e.g. gimli and shell)
Disable check for whether self is payable for now... not working right
[BUGFIX] Gimli should return only one image.  Looks like the API changed or something