Add "diveIntoObject"

 define(['rivets'], function(rivets) {
+    var diveIntoObject = function(obj, keypath, callback) {
+        if (!keypath) {
+            return callback(obj, null);
+        }
+        //return callback(obj, keypath);
+        var keyparts = keypath.replace(/^:/, '').split(/\./);
+        //console.log('diveIntoObject(keyparts):', obj, keyparts);
+        while (keyparts.length > 1) {
+            var part = keyparts.shift();
+            if (part.length == 0) {
+                continue;
+            }
+            //console.log('diveIntoObject:', obj, part);
+            obj = doObjectRead(obj, part);
+        }
+        //console.log('callback:', obj, keyparts[0]);
+        return callback(obj, keyparts.shift());
+    };
+
     rivets.binders['error-*'] = {
         bind: function(el) {
             var self = this;