drag&drop refactor, update docs

CHANGELOG.md

@@ -6,21 +6,25 @@ This project adheres to [Semantic Versioning](http://semver.org/).
 ## [new version][unreleased]
 
 ### Added
-* Show a warning when a stage has too many layers.
+* Show a warning when a stage has too many layers
 * Show a warning on duplicate ids
+* Show a warning on weird class in `Node.create` parsing from JSON
 
 ### Changed
 * Fixes inconsistent `layer.setSize()` method. Now it has same arguments as any container.
 * Full rewrite to Typescript with tons of refactoring and small optimizations. The public API should be 100% the same
 * Fixed `patternImage` and `radialGradient` for `Konva.Text`
 * `Konva.Util._isObject` is renamed to `Konva.Util._isPlainObject`.
-* changed behavior of `removeId`.
+* A bit changed behavior of `removeId` (private method), not it doesn't clear node ref, of id is changed.
+* simplified `batchDraw` method (it doesn't use `Konva.Animation`) now.
+* `id` and `name` properties defaults are empty strings, not `undefined`
 
 ### Removed
 * `Konva.Util.addMethods`
 * `Konva.Util._removeLastLetter`
 * `Konva.Util._getImage`
 * `Konv.Util._getRGBAString`
+* Removed polyfill for `requestAnimationFrame`. 
 
 ### Fixed