Add updateSlider2Input
Add QT-webkit touch detection workaround

This is from commit 813939b of ion.rangeSlider
Add script for updating ion.rangeSlider
Add format options to sliders
Add deprecation message for format argument
Simplify label code for slider2Input
Set HTML data values to "true" and "false"
Improve tick and step heuristics
Add slider2Input documentation
Re-document