Methods isActive(), getCurrentStep()
and getHighlightedElement() now work correctly
(#13).
Using step events onShow and onHide no
longer hides progress indicators shown with progress = TRUE
in $new() (#114).
Updated shepherd.js to 15.2.2.
conductor now scrolls smoothly between elements
(#19).shepherd.js to v.10.0.1isCentered() is no longer supported because it
was removed in shepherd.js v.10.0.0.