@ update dependencies
@ update async dependencie
@ update readme
+ add exception if svg objects are not instanciate with new
Merge remote-tracking branch 'origin/development' into development
upgrade underscore
correctly inherit SVGObject with util.inherits
+ replace anonymous functions by named functions (pending)
+ add setters/getters for all elements (pending)
@ debug image
+ add image gestion in svg
Merge branch 'release/0.6.0'