Merge branch 'kato-datejson' into kato-protractor

Author: katowulf

src/utils.js

@@ -374,6 +374,7 @@
             else {
               dat = {};
               utils.each(rec, function (v, k) {
+                if( v instanceof Date ) { v = v.getTime(); }
                 dat[k] = stripDollarPrefixedKeys(v);
               });
             }

tests/unit/utils.spec.js

@@ -172,6 +172,12 @@ describe('$firebaseUtils', function () {
         $utils.toJSON({foo: 'bar', baz: undef});
       }).toThrowError(Error);
     });
+
+    it('should parse dates into milliseconds since epoch', function() {
+      var date = new Date();
+      var ts = date.getTime();
+      expect($utils.toJSON({date: date}).date).toBe(ts);
+    });
   });
 
   describe('#getKey', function() {