0.5.0: 31 Jul 2011
   * initial preview release

0.5.1: 3 Aug 2011
   * support for delete 

0.6: 16 Aug 2011
   * implement Deletable. delete method for every object
   * refactor HROOT generated file names (Interface.hs, Implementation.hs, FFI.hs) 

0.6.3: 22 Sep 2011 
   * Implement Existential Types 

0.6.4: 28 Sep 2011 
   * add many TH2 class methods

0.6.6: 7 Oct 2011 
   * do not need OverlappingInstances, IncoherentInstances, UndecidableInstances 


0.6.7: 18 Oct 2011
   * implement almost all TH1 class methods

0.6.8: 20 Oct 2011
   * implement almost all class methods of TH2, TH3, TFormula, TF1 and TGraph

0.6.9: 20 Oct 2011 
   * implement almost all class methods of TLine, TAttLine, TAttMarker, TAttText and TAttPad

0.7 : 8 Nov 2011
   * separate all class interfaces and implementation in different modules
   * overhaul Existential 

0.7.1 : 12 Nov 2011 
   * support for static methods
   * add TROOT

0.8 : 17 Jun 2014
   * separate packages into HROOT-core, HROOT-hist, HROOT-io, HROOT-math, HROOT-graf and HROOT is now an umbrella package
