0.5 released

Rename the GraphmlFactory class to GraphMLFactory for consistency for the other classes names
Fix the labels default properties not set when performing edge.setLabel(text) or node.setLabel(text)
Separate the defaults for the edges labels font size from the defaults for the nodes labels font size
Change and simplify the defaults for the arrows styles for the source and the target of the arrow
Add the font style defaults for the nodes and the edges
Support the bendStyle
Allows to specify a color using an HTML color value (such as "White") rather than its hexadecimal value