Material-ui: Classname generating conflict

[solominh]

Problem description

Versions

• Material-UI: v1 alpha
• React: 15.6.1
• Browser: Google Chrome

[oliviertassinari]

The name of the stylesheet needs to be unique. I think that we should add a warning when it's not respected. Also, we need to upgrade the jss dependency. That's likely fixed on the latest version. That might even enable multiple stylesheets with the same name.

[kof]

Latest JSS switched back to the counters. To make it work server-side, we need to take an example from the https://github.com/cssinjs/react-jss/blob/next/src/JssProvider.js

The logic is the following: Provider that wraps the entire application provides the class names generator and resets the counter for each request.

@nathanmarks we need to talk about it and updating theme-reactor.

[oliviertassinari]

The styleSheet names are now optional. We will use them over the display name when provided in development to help to debug the class names injected into the page.