Global: Improve getMaxScrollForTransition definition and usage docs

Fixes gh-274
Global: Improved wording
Build: Use vagrant for sample config
Collapsible: Removed link to not existing mini-style page
Slider: Undeprecated the widget
Rangeslider: Undeprecated the widget
Slider: Added link to new Flipswitch widget
1.4.7
Pagecontainer: Document that external widgets must also be copied

When navigating between HTML documents with Ajax and pushState, every one of
those documents must contain copies not only of the header scripts, but also of
the widgets that are external to pages, but shared between them.

Fixes gh-304