0.9.1 :
* Bugs corrections
* Add the ability to create edge like that : node1 << node2 << node3 ...
* Complete README
* Add a DOT parser. This parser has a lot of limitations. So don't use it in a production context !
* :output and :file options are deprecated, please use :<format> => :<file>
* You can now specify multiple outputs via :<format> => :<file> (see sample 22).

0.9.0 :
* Add fdp example (sample 15)
* Add edge between cluster and node and cluster and cluster support
* GraphViz.add_node now support array (sample 16)
* Bug correction in GraphViz.output (sample 19)
* Add GraphViz#default to set default options (:use, :path and :output)
* Add possibility to set node or edge attribut via :
		node.<attribut>=<value> or node.<attribut>( <value> )
		adge.<attribut>=<value> or adge.<attribut>( <value> )
* Add GraphViz::Edge.set and GraphViz::Node.set
* Add sample 20
* Add GraphViz.node_count and GraphViz.edge_count by Daniel Cadenas Nión

0.8.2 : 
* Update Node, Edge and Graph Attributes (see http://www.graphviz.org/doc/info/attrs.html)
* Bugs corrections

0.8.1 :
* Documentation

0.8.0 :
* Add all the features of the current graphviz version

0.7.0 :
* Add option "path" to output

0.6.0 :
* Add undirected graph support

0.5.0 :
* Preserve the original order of creation of nodes and edges

0.4.0 :
* Add HTML-Labels

0.3.0 :
* Bugs corrections

0.2.0 :
* Pure ruby

0.1.0 :
* Initial version