Changes to notice files and quickstart archetype
add in2ex distribution management configuration
add release script for in2experience releases
aggregate javadoc  if in2ex profile is enabled
fix ClassNotFoundException: void in WicketObjects.cloneObject
fix WICKET-5252,WICKET-5254 don't increase visibility of getters, setter or fields in PropertyResolver
release wicket-6.12.0-IN2EX