Version bump to 0.2.0.
Move default colors to .btn-default modifier. Make .btn-default and .btn-destroy "extend" .btn.
Make labels vertical-align middle.
Fix .btn classes in templates.
Add update to db-updater that changes ratings from "2, 1, -1, -2" to "1, -1". #25
Refactor rating UI after changing the rating values. Closes #25