code: function wrapPointer (pointer, min, max) {
          return pointer > max ? min : (pointer < min ? max : pointer);
      }
docs: Wraps a pointer (number) around a bounds (range of two numbers) or returns the next valid pointer depending
  on direction:  E.g.,
  If pointer is less than `min` then returns `max`.  If pointer is greater than `max` returns `min`.
  If pointer is within bounds then returns `pointer`.
  @function module:sjl.wrapPointer
  @param pointer {Number}
  @param min {Number}
  @param max {Number}
  @returns {Number}