Ensure other key presses work as usual when the slider handle has focus

[chrishutchinson]

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Unfortunately my last PR was calling e.preventDefault() on all key presses after the slider handle had gained focus. This was preventing a user from tabbing to the next focusable element, or to any previous element. This restores that functionality, while keeping the arrow key controls.

[paustint]

Resolves #90

[karl-run]

Could we get this merged @whoisandy ?

[igilfillan]

Please merge this to fix the accessibility issue. Thanks

[karl-run]

@igilfillan: I had to abandon this library, I can recommend this: https://www.npmjs.com/package/react-slider

It's what we went with, it works very well and it's much better to style it from the bottom up instead of overwriting existing style.

[guilleccc]

Any chance to merge this soon?

[kancha12]

@whoisandy Can you please review and merge this PR. Currently the keyboard accessibility is broken. Its impacting the entire page as the focus out of the slider is not working.

[thomasnordlund]

Yep, this is a deal breaker.