CHANGELOG

v0.5.6
  date: Apr 05, 2014
	- Using Object.create where possible to avoid node id collision with
	standard object property names (e.g. `constructor`)
	- Fixed bug in constant layout

v0.5.5
  date: Feb 22, 2014
	- Stable threshold can now be configured via options (Tnanks to @grnadav)

v0.5.4
  date: Feb 19, 2014
	- Webgl renderer supports centering API (Thanks to @sgerard)

v0.5.3
  date: Dec 27, 2013
	- Small clean up in renderer
	- Added pan/zoom API for SVG

v0.5.2
  date: Nov 23, 2013
	- Euler integrator now supports custom time step

v0.5.1
  date: Nov 20, 2013
	- Merged changes from v0.4.2: custom links length + fixed bug in arguments
	order

v0.5.0
  date: Oct 20, 2013
  BREAKING CHANGES:
  - graph.addNode() no longer augments old data model with whatever passed
    to method. Instead it stores direct reference to passed node's model
  - node/link objects no longer store layout specific properties. Instead you can
    query all layout properties from layout class itself. This allows the same
    graph to be layed out by two different layout algorithm, without stepping
    on toes of each other
  - node/link objects no longer store ui specific properties. Instead you
    can query them from specific UI provider

v0.4.2
  date: Nov 20, 2013
  changes:
    - Added customization point to force directed layout to allow specify custom links length.
    - Fixed a bug with wrong arguments order in physics simulator.

v0.4.1
  date: Jul 20, 2013
	changes:
	  - Layout algorithm now listens to changes from graph directly. Public API
		  to add/remove nodes or links is dropped from layout algorithms.
		- Added small performance test for node.js

v0.4.0
  date: April 7, 2013
  changes:
    - Migrated to grunt.js as a build system
    - Dropped jslint support in favor of jshint.
    - Cleaned up unused code:
        * GEM/ACE layout files are removed from repository. If you need them for
        the reference, please find them in the project's commits history.
        * Runge Kutta integrator is dropped