Add comments on 'lifeline' pipe
Clarify naming a bit
Add a shared bitset class
Fix buffer full condition in deque
Clarified comments
Add #to_i and #to_s to SharedBitset
Make method processor_count private
Fix indentation of 'private' per style guide
Expose ProcessWrapper#pid
First stab at SharedMemoryPool
First light on SharedMemoryPool via IO
Remove commented-out alternate approach