Added crystals module directory
Moved d3 tree output into crystals dir
We don't need a new module type for this
Add 'children' shortcut to datastructure to denote addtl. depth

Being able to check an object for the presence of a 'children' alias is
much faster/nicer than having to check the type of 'value' each time.
Added crystals util for converting lowstate "underpipedash" format
Simplified tree crystal into single-function form
Added HTML crystal which mimic's Salt's "nested" outputter
wip
wip: buncha crystals