Fix _updateElems missing function.

Adding fix for rSmart/issues#207. There was a bug in countdown for safari browsers. See https://github.com/kbwood/countdown/issues/18. This should fix the problem

squash! Adding fix for ISSUE-207. There was a bug in countdown for safari browsers. See https://github.com/kbwood/countdown/issues/18. This should fix the problem

fixes rSmart/issues#207