Question: Can publicPath be set to './' in the generated file?
**Description**
In a scenario where I am generating a CSS library and using font icons as a fallback, could I set the font-face paths to be a relative path in the generated file?

This way the CSS lib would load the files irrespective of the domain its injected into.

**What I have tried**
I have tried the suggestions in #28, but that does not seem to alter the output path with the current version.

**Additional Info**
Unless I am missing something, I guess the usage of nodejs `url.resolve` on this [line](https://github.com/jeerbl/webfonts-loader/blob/59a96f26c6ca347005f6abbd8599847c667354d2/index.js#L176) would discard the relative paths in most scenarios. 

```node
> url.resolve('/','/iconpath')
'/iconpath' // path discarded 
> url.resolve('./','/iconpath')
'/iconpath' // path discarded 
> url.resolve('./','iconpath')
'iconpath' // path discarded 
> url.resolve('https://example.com','/iconpath')
'https://example.com/iconpath' // path kept
```