* Additional helpers:
  * Map - maps the items in the set and returns them as a new set
  * MapTo - maps the items in the set into a provided set
  * MapToSlice - maps the items in the set and returns them as a slice
  * Filter - filters the items in the set based on the function and returns a new set
  * Reduce - reduces the items in the set to a single value
  * ReduceRight - reduces the items in the ordered set, in backwards order, to a single value
  * ForEach - calls the provided function with each member of the set
  * ForEachRight - calls the provided function for each item in the ordered set, in backwards order.
* Cleaned up some Examples so they now use New{Ordered,}With instead of New{Ordered,} and multiple Adds

#minor