Changes

#376 Override normal flowchart arrowhead to allow css styling
Class diegram support
#390 Improvements to the cli regarding how configuration sent to the cli and verbouse is a new command line argument.
#395 New neutral theme
#400 Fix for line endings in generated svg
#423, #427 Placements actor label in sequence diagram
Improvments to the logger so that it logs the stacktrace in som circumstances.
#429 Uses an empty text node instead of a string for svg group labels
#430, #433, #435 fix gantt chart cli configuration parsing including functions
Documentation impromenents
#445 Fix for cli css style selector lowercase problem
#441 Updated d3
#449 Allow .node>circle to receive css styles
#452 Customizing link style with any color sets fill property to black instead of none

Closed issues by this release:
#341
#362
#367
#389
#400
#416
#422
#428
#431
#434