RienNeVaPlus

/**
 * ☃ dateDiff "Snowman Carl" (http://stackoverflow.com/questions/13903897)
 * Returns a detail object about the difference between two dates
 *
 * When providing custom units, provide them in descending order (eg week,day,hour; not hour,day,week)
 *
 * @param {Date} dateStart - date to compare to
 * @param {Date|string} [dateEnd=new Date()] - second date, can be used as unit param instead
 * @param {...string} [units=Object.keys(dateDiffDef)] - limits the returned object to provided keys
 */