- [x] Dropdown for setting the card as checked/unchecked.
- [x] Make it look more the makesprite/concrete.css theme.
- [x] When moving between columns don't insert an extra newline before, unless moving to an empty column.
- [x] Give each column a max width of 450px and have them stretch to fill the area up to that.
- [x] Don't put carriage returns between individual TODO list items. As far as possible try to preserve original formatting, just moving individual lines around without disturbing other lines.