April 2013, Version 0.1.6
-------------------------
* Removed ggobi support
* Removed "save navGraph handler" in RnavGraph menu (as it is
  not permitted to modify the Global Environment from package code)
* Some changes to compile without warnings under R 3.0.0

July 2012, Version 0.1.4
------------------------
* RBGL 1.32.1 temporarily sacrifieced layout.cpp, hence
  kamadaKawaiSpring and fruchtermanReingold layouts
  currently not working

New to Version 0.1.3
--------------------
* fixed .onLoad and .onAttach

New to Version 0.1.2
--------------------
* Vignette updated
* Minor Bug fixes

New to Version 0.1.1
--------------------
* Brushing Bug Fix for tk2d

New to Version 0.1.0
--------------------
* new functions/methods: ng_get_color, ng_set_color<-, ng_get_size, ng_set_size<-
* color choosers open now centered over their parent windows
