Update sigma.parsers.gexf.js

Need to do : 
obj.y = - obj.viz.position.y; 

Otherwise the graph is up side down compared to what you had in gephi. Can be annoying for map for example.
Add timeout for Firefox to dragNodes plugin.  Closes #278.
Fix for overlapping nodes not being draggable
Fix case where initial node isn't considered current when it hasn't been left after entering/exiting an overlapping node
Remove check for over/outNode occurring multiple times. Unnecessary.
Fix comments
Better variable name for array of hovered nodes
Rework of hover logic to allow a single label to be displayed
Add self referenced nodes edge rendering.
add right click events

Add rightClick, rightClickStage, rightClickNode, and rightClickNodes
events
Merge remote-tracking branch 'origin/master' into captors-mouse-right-click
add 'renderers custom edge shapes' plugin
add tapered edges
update README
Add graph.attachBefore
add graph.adjecentNodes and adjacentEdges
add the filter plugin
add the example
add i/o and fix minor stuff
update README