PR for issue #31: cozy-dev dev:init fails to add the box properly

Pull request for issue #31.

Florent
The `~` operator is the "bitwise NOT" operator. 
https://developer.mozilla.org/en-US/docs/Web/JavaScript/Guide/Expressions_and_Operators#Bitwise_operators

It is often used to compare with `-1` (`~(-1)` returns false), especially when using `indexOf`. I used that trick to be within the 80 chars per-line limitation... May I change that line so the test is clearer?

Florent