chore($q): rename `promise.always` to `promise.finally`

BREAKING CHANGE: the `always` method has been renamed to `finally`.

The reason for this change is to align `$q` with the Q promises library,
despite the fact that this makes it a bit more difficult to
use with non-ES5 browsers, like IE8.

`finally` also goes well together with `catch` api that was added to
$q recently and is part of the DOM promises standard.

To migrate the code follow the example below:

Before:

$http.get('/foo').always(doSomething);

After:

$http.get('/foo').finally(doSomething);

or for IE8 compatible code:

$http.get('/foo')['finally'](doSomething);

1 files changed, 6 insertions, 2 deletions

diff --git a/src/ng/q.js b/src/ng/q.js
index e3c64645..307dc1b4 100644
--- a/src/ng/q.js
+++ b/src/ng/q.js
@@ -93,12 +93,16 @@
  *
  * - `catch(errorCallback)` – shorthand for `promise.then(null, errorCallback)`
  *
- * - `always(callback)` – allows you to observe either the fulfillment or rejection of a promise,
+ * - `finally(callback)` – allows you to observe either the fulfillment or rejection of a promise,
  *   but to do so without modifying the final value. This is useful to release resources or do some
  *   clean-up that needs to be done whether the promise was rejected or resolved. See the [full
  *   specification](https://github.com/kriskowal/q/wiki/API-Reference#promisefinallycallback) for
  *   more information.
  *
+ *   Because `finally` is a reserved word in JavaScript and reserved keywords are not supported as
+ *   property names by ES3, you'll need to invoke the method like `promise['finally'](callback)` to
+ *   make your code IE8 compatible.
+ *
  * # Chaining promises
  *
  * Because calling the `then` method of a promise returns a new derived promise, it is easily possible
@@ -274,7 +278,7 @@ function qFactory(nextTick, exceptionHandler) {
           return this.then(null, callback);
         },
 
-        always: function(callback) {
+        "finally": function(callback) {
 
           function makePromise(value, resolved) {
             var result = defer();