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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