Merge pull request #64 from augbog/master

Added Accessor Functions to Zoom
Fix javadoc and parameter
Replaced LinearScale by QuantitativeScale
added license headers
format
Added Geometry Hull API + demo
Merge branch 'master' of https://github.com/gwtd3/gwt-d3.git
Added geom.polygon API + demo / started with geo API
Added licnese
started with QuadTree API but freeze the dev cause of API inconsistency
/ ambiguity , see issue https://github.com/mbostock/d3/issues/1467
removed EventListener class
did some cleaning
upgrade to d3 v3.2.8