Expected Behavior

As the slider is changed, show the value of the slider.

@gilboonet suggests "An option to show/hide slider value would be great."

Actual Behavior

The slider is shown but there's no display of the current value.

Steps to Reproduce the Problem

1. Open the example call "All Parameter Types"
2. There slider can be moved but there's not value displayed.

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Summary

d3-x3dom has a mix of tape and mocha unit tests. The aim is to convert all tests to mocha.

Detail

2 tests (indexTest.js and dataTransformTest.js) have already been converted and mocha has been added to package.json

• Convert remaining tests to mocha ensuring thay all still pass.
• Remove tape and tap-spec from package.json.
• Update CONTRIBUTING.md to remo