Non ASCII characters in filenames break the build

[gmarty]

The build returns an error if you try to generate a file with non ASCII characters in the path. This minimal example:

---
title: Japanese
route: 日本語.html
---

generates the following error message:

> phenomic build

ℹ Phenomic is starting +0.25s
✔ Copying assets +0.99s
✔ Building client files +13.44s
✔ Preparing static build +3.38s
✔ Building static files +0.21s
✖ Build failed
ReferenceError:

fetch is not defined

    at exports.default (~/simple-json-fetch/lib/index.js:10:1)
    at Object.get (~/phenomic/lib/redux/modules/pages.js:83:1)
    at Object.getPage (~/phenomic/lib/components/PageContainer/index.js:29:1)
    at PageContainer.preparePage (~/phenomic/lib/components/PageContainer/component.js:152:1)
    at PageContainer.componentWillMount (~/phenomic/lib/components/PageContainer/component.js:95:1)
    at ReactCompositeComponentWrapper.performInitialMount (~/react/lib/ReactCompositeComponent.js:350:1)
    at ReactCompositeComponentWrapper.mountComponent (~/react/lib/ReactCompositeComponent.js:257:1)
    at Object.mountComponent (~/react/lib/ReactReconciler.js:47:1)
    at ReactCompositeComponentWrapper.performInitialMount (~/react/lib/ReactCompositeComponent.js:370:1)
    at ReactCompositeComponentWrapper.mountComponent (~/react/lib/ReactCompositeComponent.js:257:1)
    at Object.mountComponent (~/react/lib/ReactReconciler.js:47:1)
    at ReactCompositeComponentWrapper.performInitialMount (~/react/lib/ReactCompositeComponent.js:370:1)
    at ReactCompositeComponentWrapper.mountComponent (~/react/lib/ReactCompositeComponent.js:257:1)
    at Object.mountComponent (~/react/lib/ReactReconciler.js:47:1)
    at ReactDOMComponent.mountChildren (~/react/lib/ReactMultiChild.js:240:1)
    at ReactDOMComponent._createContentMarkup (~/react/lib/ReactDOMComponent.js:661:1)[ truncated stack ]

[MoOx]

I think I have an idea why this trigger a "fetch" issue. Will have a look tonight.

[gmarty]

I can take a look if you point me in the right direction.

[MoOx]

It might be a bit tricky to fix, I am on it.

[MoOx]

@gmarty I will do more test about that.

[MoOx]

Probably fixed in v1.