Fix SerializedObject.append perf issue: * Replace array.concat(array2) with Array.prototype.push.apply
Fix SerializedObject.append perf issue:
* Replace array.concat(array2) with Array.prototype.push.apply

darkdarkdragon/ripple-lib,ripple/ripple-lib,darkdarkdragon/ripple-lib,ripple/ripple-lib,darkdarkdragon/ripple-lib,ripple/ripple-lib,ripple/ripple-lib,wilsonianb/ripple-lib,wilsonianb/ripple-lib,wilsonianb/ripple-lib