Forgotten var
`file` var isn't used
Ability to import another component's stylus file

Add the component's dependencies (local and online) to `options.paths`.
We are now able to import another stylus file directly inside the component.

```
{
  ...
  "local": [
    "base-styles"
  ],
}
```

```
@import "base-styles/animation-mixin";
```

However, we must be careful not to import files containing CSS properties, otherwise they will be duplicated in the output.

Related to #6
Dependencies are already imported
Add tests
Merge pull request #9 from kewah/imports-component

Imports component