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v2 rangeSlider/Rheostat: flattenChildren warnings

See original GitHub issue

Bug: What is the current behavior? Thousands of warnings is js console. On initial load and with every adjustment to a slider:

warning.js:36 Warning: flattenChildren(...): Encountered two children with the same key, `3:$0.00001`. Child keys must be unique; when two children share a key, only the first child will be used.
    in div (created by Rheostat)
    in Rheostat (created by Slider)
    in Slider (created by Slider-HeaderFooter)
    in div (created by Slider-HeaderFooter)
    in div (created by Slider-HeaderFooter)
    in Slider-HeaderFooter (created by HeaderFooter-AutoHide)
    in div (created by HeaderFooter-AutoHide)
    in HeaderFooter-AutoHide

What is the version you are using? Always use the latest one before opening a bug issue. v2.0.0-beta.2