fix(equals): {} and [] should not be considered equivalent

angular.equals was returning inconsistent values for the comparison between
{} and []:

    angular.equals({}, []) // true
    angular.equals([], {}]) // false

Since these object are not of the same type, they should not be considered
equivalent.

src/Angular.js

@@ -687,6 +687,7 @@ function equals(o1, o2) {
   if (t1 == t2) {
     if (t1 == 'object') {
       if (isArray(o1)) {
+        if (!isArray(o2)) return false;
         if ((length = o1.length) == o2.length) {
           for(key=0; key<length; key++) {
             if (!equals(o1[key], o2[key])) return false;
@@ -698,7 +699,7 @@ function equals(o1, o2) {
       } else if (isRegExp(o1) && isRegExp(o2)) {
         return o1.toString() == o2.toString();
       } else {
-        if (isScope(o1) || isScope(o2) || isWindow(o1) || isWindow(o2)) return false;
+        if (isScope(o1) || isScope(o2) || isWindow(o1) || isWindow(o2) || isArray(o2)) return false;
         keySet = {};
         for(key in o1) {
           if (key.charAt(0) === '$' || isFunction(o1[key])) continue;

test/AngularSpec.js

@@ -289,6 +289,11 @@ describe('angular', function() {
       expect(equals(/^abc/, /abc/)).toBe(false);
       expect(equals(/^abc/, '/^abc/')).toBe(false);
     });
+
+    it('should return false when comparing an object and an array', function() {
+      expect(equals({}, [])).toBe(false);
+      expect(equals([], {})).toBe(false);
+    });
   });
 
   describe('size', function() {