Make `RSVP.all` work with more than just promises.

lib/rsvp.js

@@ -138,8 +138,12 @@ function all(promises) {
     reject(allPromise, error);
   };
 
-  for (i = 0; i < remaining; i++) {
-    promises[i].then(resolver(i), rejectAll);
+  for (i = 0; i < promises.length; i++) {
+    if (promises[i] && typeof promises[i].then === 'function') {
+      promises[i].then(resolver(i), rejectAll);
+    } else {
+      resolveAll(i, promises[i]);
+    }
   }
   return allPromise;
 }

tests/extension-tests.js

@@ -125,5 +125,17 @@ describe("RSVP extensions", function() {
         done();
       });
     });
+
+    specify('works with a mix of promises and thenables and non-promises', function(done) {
+      var promise = new RSVP.Promise(function(resolve) { resolve(1); });
+      var syncThenable = { then: function (onFulfilled) { onFulfilled(2); } };
+      var asyncThenable = { then: function (onFulfilled) { setTimeout(function() { onFulfilled(3); }, 0); } };
+      var nonPromise = 4;
+
+      RSVP.all([promise, syncThenable, asyncThenable, nonPromise]).then(function(results) {
+        assert.deepEqual(results, [1, 2, 3, 4]);
+        done();
+      });
+    });
   });
 });