feat(ticks): Refactor ticks to improve flexibility

[ValentinH]

Now it uses transform and explicit positioning. The goal is to add an option that would enable a user to precisely position slider ticks. It also adds a ticksArray option that takes an array of values that should be marked with a tick.

Demo: http://jsfiddle.net/ghjqt6ge/

To do:

• tests
• add an option to display ticks under the slider like when showTicksValues > 1

[codecov-io]

Current coverage is 100% (diff: 100%)

Merging #426 into master will not change coverage

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