Make sure that the _start item is cleaned up during save.

diff --git a/src/Chart.Core.js b/src/Chart.Core.js
index bb8f3ece97571211b5e53c915ce79f3b8fea1b75..13603c8825788a33b0525e56291ef471a541ddd0 100755 (executable)
--- a/src/Chart.Core.js
+++ b/src/Chart.Core.js
@@ -1181,6 +1181,7 @@
                save: function(){
                        this._vm = clone(this);
                        delete this._vm._vm;
+                       delete this._vm._start;
                        return this;
                },
                transition : function(props, ease){