feat(logScale): Implement a logScale option

[ValentinH]

Implement a logScale option to display sliders with logarithmic scale.
Demo: http://jsfiddle.net/v6spvvpg/

Todo:

• handle ticks

[codecov-io]

Current coverage is 100% (diff: 100%)

Merging #280 into master will not change coverage

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[BrunoCartier]

This would be a useful feature 👍

[ValentinH]

I could merge it but it won't support ticks cause I couldn't find a way to display them correctly.

[sebnyc]

Hi Valentin,
Greetings from a French expatriate from NYC.
Would you consider merging this pull request (even without ticks) ? I would definitely use it if it was made available.
Sébastien

[ValentinH]

OK I'll merge it. Just need to add tests then. ;)

[ValentinH]

This was merged and released under 5.7.0