chore(packaging): bump version to 2.0.0-alpha.21; add changelog

CHANGELOG.md

@@ -0,0 +1,38 @@
+<a name="2.0.0-alpha.21"></a>
+# 2.0.0-alpha.21 (2015-04-27)
+
+
+## Features
+
+- **dart/transform:** Dedup getters, setters, & methods
+  ([15376a6d](https://github.com/angular/angular.js/commit/15376a6d243740c73cf90f55525d1710cdd156f5))
+- **facade:** add isType method
+  ([e617ca63](https://github.com/angular/angular.js/commit/e617ca6323902bd98c0f1eb990b82f6b8d3c98e3))
+- **parser:** support === and !== operators
+  ([afe0e454](https://github.com/angular/angular.js/commit/afe0e454537f9252f9cf313647e649cfa464f96f),
+   [#1496](https://github.com/angular/angular.js/issues/1496), [#1500](https://github.com/angular/angular.js/issues/1500))
+- **router:** add initial implementation
+  ([1b2754da](https://github.com/angular/angular.js/commit/1b2754dacdd15e8fea429d56cdacb28eae76d2b1))
+- **view:** reimplemented property setters using change detection
+  ([8ccafb05](https://github.com/angular/angular.js/commit/8ccafb0524e3ac4c51af34ef88e0fe27482336a6))
+
+
+## Performance Improvements
+
+- **benchmarks:**
+  - benchmark that measure cost of dynamic components
+  ([427f0d02](https://github.com/angular/angular.js/commit/427f0d021c51ea6923edd07574a4cc74a1ef84e6))
+  - benchmark measuring cost of decorators (fixes #1479)
+  ([9fc9d535](https://github.com/angular/angular.js/commit/9fc9d535667c620017367877dbc2a3bc56d358b7))
+
+
+## Other (malformed commit messages)
+
+- **other:**
+  - feat: alllow specifying directives as bindings
+  ([4bab25b3](https://github.com/angular/angular.js/commit/4bab25b3666f4247434ad5cb871906fb063fef51),
+   [#1498](https://github.com/angular/angular.js/issues/1498))
+  - fix: export ShadowDom strategies
+  ([6896305e](https://github.com/angular/angular.js/commit/6896305e34082c246769829e4258631c1d2363d1),
+   [#1510](https://github.com/angular/angular.js/issues/1510), [#1511](https://github.com/angular/angular.js/issues/1511))
+

package.json

@@ -1,6 +1,6 @@
 {
   "name": "angular",
-  "version": "2.0.0-alpha.20",
+  "version": "2.0.0-alpha.21",
   "description": "Angular 2 - a web framework for modern web apps",
   "homepage": "https://github.com/angular/angular",
   "bugs": "https://github.com/angular/angular/issues",