Query for body temperature samples. the options object is used to setup a query to retrieve relevant samples.```javascriptletoptions={unit:'celsius',// optional; default 'celsius'startDate:(newDate(2016,4,27)).toISOString(),// requiredendDate:(newDate()).toISOString(),// optional; default nowascending:false,// optional; default falselimit:10,// optional; default no limit};```Available units are: `'fahrenheit'`, `'celsius'`.The callback function will be called with a `samples` array containing objects with *value*, *startDate*, and *endDate* fields.```javascript