brunch plante à la compilation de feuilles de style basées sur knacss7
La cause est sans doute dûe à l'absence de guillemets entourant les svg inline des .radio et .checkbox :checked
Tous les autres bacgkround-image : url() ont bien les guillemets entourant leur valeur.
```
11:52:03 - error: Compiling of app/styles/app.styl failed. L2485:47 app/styles/_knacss-
2481| transition: background-color .15s;
2482| }
2483|
2484| .radio:checked {
2485| background-image: url(data:image/svg+xml,%3C%3Fxml%20version%3D%221.0%22%20standalone%3D%22no%22%3F%3E%3Csvg%20version%3D%221.1%22%20width%3D%2240%22%20height%3D%2240%22%0AviewBox%3D%220%200%2080%2080%22%20xmlns%3D%22http%3A//www.w3.org/2000/svg%22%3E%3Ccircle%20cx%3D%2240%22%20cy%3D%2240%22%20r%3D%2224%22%20style%3D%22fill%3A%23ffffff%22/%3E%3C/svg%3E);
-------------------------------------------------------^
2486| background-size: 80% 80%;
2487| background-position: center;
2488| background-repeat: no-repeat;
illegal unary "%", missing left-hand operand
```
