extending snake model styling support
shape support
extended paint functionality
diagram decorator
fill color support
added support for diagram select action on nodes to show the
corresponding node dialog
added imageview support
fixed zooming for all node types
refactoring of diagram to be used as paintdata e.g. for SnakeNode
added drag&drop for shpaes inside diagram
handson scrolling
fixed zooming behaviour by adding SnakeFXZoomPane
sizing of nodes
fixed resizing for rectangle nodes
supporting ellipse
push changes to github