Fixed many bugs, added Sankey visualization

Fixed many bugs, added Sankey visualization
Changed dex.js generation
Changes to misc examples
Misc changes to examples
Changed BarChart to expand user supplied options

Also added many configurable options and removed unnecessary console
logging.  Bars now inherit from rectangle making them much more
configurable.
Changed comment
Configuration defaults changes

Changes related to how certain things are configured.  Added link config
and generic routines for setting attributes and styles based on
existence of field.
Added ability to trace nodes and links
Added keys function
Fixed node labeling
Expanded config

Added many more configuration options
Master build changes
New documentation images
Added test image
Regenerated
Misc bug fixes
Misc bug fixes
Minor formatting change.
Minor bug fixes and documentation improvement
Minor bug fixes and documentation improvement