sole/tween.js — pull request #147 by BryanMorgan (2014-08-31 20:28:38+00:00)
Title: Fix onStart to match user guide

The user guide's reference to onStart doesn't work as expected (see http://jsfiddle.net/BryanMorgan/trL3k6j1/ for an example). This change simply resets the _valuesStart object if the onStart callback is fired in case the values are changed inside the callback.