Slices passed in arguments object (not own arguments object) into array from `start` to `end`.
@function module:sjl.restArgs
@param args {Arguments|Array}
@param start {Number|undefined}
@param [end] {Number|undefined} - Optional.  Default `args.length`.
@returns {Array}
function restArgs (args, start, end) {
        end = end || args.length;
        return slice.call(args, start, end);
    }