PivotUI generates HTML using a table which has a fixed layout.  The alternative UI generates a set of <div> tags.  The presentation of these tags can be defined using only CSS. The updated ./dist/pivot.css includes CSS that create a facsimile of the table presentation.  The facsimile is not exactly the same but it can be with a little more effort.

The styles create a presentation that is a facsimile of the PivotUI table based layout.  The facsimile is similar to the table layout but not identical - but it could be with a bit more effort,  It is provided to illustrate how the generated <div> tags can be manipulated.

Version 0.5.5 references a version of require-dir that uses invalid node because some properties were deprecated in node 8.x.  gulp-git version 2.8.0 references require-dir 1.0.0 which doesn't use the invalid property.

It is required to prevent a gulp crash with the message:

'''gulp[16200]: src\node_contextify.cc:628: Assertion `args[1]->IsString()' failed.```

Now there is one UI function.  The layout HTML generated can be <table> based or <div> based depending upon the value of a new option called 'tag'.  This option can have the value of 'table' (the default) or 'div'.

Further modified to use inline if then ... else ... statements which has the effect of slimming the changes made.

Added support for a responsive layout but adding the 'responsive' tag which takes values true or false.  This option only had an effect when the 'tag' option is set to 'div'

Updated the CSS for the <div> layout to more closely resemble the table layout.  Also added directives to illustrate how the <div> layout can be responsive.  The directive change the layout to a stacked presentation when the display device is a handheld one such as a mobile phone or if the page width is 800px or less.