Feature: add doc for durationStep, extensivly note durationSteppers
1.5.0-pre fold durationflipbox into flipbox

durationflipbox was almost a carbon copy of flipbox.  This adds a few bytes to flipbox
(well under 2k minimized), it was an extra 7k of code bloat in the repo.

Note that customflip will not be going away - it provides a coders reference on how these
modules are made - it's more for that use than for a true use on it's own.
1.5.0-pre Use control groups for bottom buttons.  Much prettier
Refactor build chunk - dropped more than 2k of cruft
Build: stop regenerating requirejs include on dev builds.  This is going away anyway...  more to follow
Drop themeDateHigh from flipbox (it made very little sense), and document useCollapsedBut better
CSS: bunch of fixes, fix datebox particularly.  Also, start using the themebuilder source to develop, then generate when it is "right"