Don't assign wiredep() result

Since executing `wiredep()` doesn't return anything, we don't really need to store the result.

Obviously, the PR would be incomplete without a GIF:

![BOOP!](https://f.cloud.github.com/assets/9906/1699448/dd873d5c-5f9e-11e3-8b79-dffd2ac3b6d7.gif)