- fix handling of generic node attributes
0.8.6beta
- change toString() implementation, now you can use
  the output to generate a graphviz document by calling 
  Graph.toString()
- fix a bug with not setting the direction type
  in edges
0.8.5beta
- add small manual
- fix handling of generic graph attributes
0.8.4beta
- add documentation in several files
- jar contains binaries only, use tgz for distribution
