Fix Bootstrap Slider (b:slider2) Issues

[TheCoder4eu]

The new component b:slider2 introduced with v1.0.0 needs some fixes/enhancements before leaving experimental status:

• 🚫 the value of the input box changes only sliding the slider and not clicking on the slide bar
• the old Slider had as feature changing size of the sliding handle, we have to adapt CSS for this new component as shown in Example 10 in the documentation here http://seiyria.com/bootstrap-slider/
• the old Slider didn't allow to move the handle if the slider is disabled or readonly, we have to keep the same behaviour
• we should fix how input floats are handled now the user cannot type commas in inputs ( JS issue, also rework the page: IMHO all sliders should demo with integers an we should have a specific float demo)

[TheCoder4eu]

Reverted Slider2 to a Integer Slider.

[TheCoder4eu]

Fix to not allow to move the handle if the slider is disabled.

[TheCoder4eu]

Added support for different size s Handle.
Warning: I had to do a trivial patch to the slider JS to get additional custom classes accepted.
TODO: add info on custom handle in Doc.

[TheCoder4eu]

The value of the input box changes only sliding the slider and not clicking on the slide bar

This happens also in Example 6, I suspect that the click events are not handled.

[TheCoder4eu]

The click events are intercepted, so I have no way to get the click event.
Surprisingly, the aria attributes on the handle are updated, so it is a "bug" of the library, they missed updating the input value too.
There could be a way detecting aria attribute change but it would be better and cleaner if the library does it.

[TheCoder4eu]

I close this Issue, I opened Issue #699 for the click problem.