299b220f5e
In order to make the behavior compatible with $rootScope.$watch and $rootScope.$on methods, and
make it possible to deregister an attribute observer, Attributes.$observe method now returns a
deregistration function instead of the observer itself.
BREAKING CHANGE: calling attr.$observe no longer returns the observer function, but a
deregistration function instead.
To migrate the code follow the example below:
Before:
```
directive('directiveName', function() {
return {
link: function(scope, elm, attr) {
var observer = attr.$observe('someAttr', function(value) {
console.log(value);
});
}
};
});
```
After:
```
directive('directiveName', function() {
return {
link: function(scope, elm, attr) {
var observer = function(value) {
console.log(value);
};
attr.$observe('someAttr', observer);
}
};
});
```
Closes #5609
AngularJS 
AngularJS lets you write client-side web applications as if you had a smarter browser. It lets you use good old HTML (or HAML, Jade and friends!) as your template language and lets you extend HTML’s syntax to express your application’s components clearly and succinctly. It automatically synchronizes data from your UI (view) with your JavaScript objects (model) through 2-way data binding. To help you structure your application better and make it easy to test, AngularJS teaches the browser how to do dependency injection and inversion of control. Oh yeah and it also helps with server-side communication, taming async callbacks with promises and deferreds; and makes client-side navigation and deeplinking with hashbang urls or HTML5 pushState a piece of cake. The best of all: it makes development fun!
- Web site: http://angularjs.org
- Tutorial: http://docs.angularjs.org/tutorial
- API Docs: http://docs.angularjs.org/api
- Developer Guide: http://docs.angularjs.org/guide
- Contribution guidelines: http://docs.angularjs.org/misc/contribute
- Dashboard: http://dashboard.angularjs.org
Building AngularJS
Once you have your environment setup just run:
grunt package
Running Tests
To execute all unit tests, use:
grunt test:unit
To execute end-to-end (e2e) tests, use:
grunt package
grunt test:e2e
To learn more about the grunt tasks, run grunt --help and also read our
contribution guidelines.