Automatic Layout

- automatic-layout support (see issue #34) as incubating feature
  (uses JUNG library). (by @TCMBoby)
- minor API changes that simply custom skin creation and reduce code
  redundancy    (by @aalmiray)

Author: miho

gradle/version-info.gradle

@@ -1,3 +1,3 @@
 // maven deployment properties
 group = 'eu.mihosoft.vrl.workflow'
-version = '0.2.2'
+version = '0.2.3'