Migrate to Cycle.js v7.0

[nicoespeon]

Cf. https://github.com/cyclejs/core/releases/tag/v7.0.0

May solve #5 using xstream by the way.

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• [X] upgrade babel / brunch
• [ ] dig issue deeper with snabbdom after brunch issue has been closed
• [ ] upgrade cyclejs
• [ ] move to xstream

[nicoespeon]

I've got an issue with the combination Cycle.js Diversity + ES6 + Brunch. After debugging for a while, it looks to come from Brunch.

Waiting for https://github.com/brunch/brunch/issues/1449 to be resolved.

[nicoespeon]

Opened issue on brunch has been closed: https://github.com/brunch/brunch/issues/1449#event-736880005

The problem isn't resolve yet but I need to dig it further to snabbdom.