Enable Process Reaping in All Conditions

Process reaping via the SIGCHLD handler is now enabled in all
circumstances, instead of just when os.fork is being used.

Fixes #95
Fix #97: rebind.so not found when installed

This should fix the upstream Debian bug:
http://bugs.debian.org/cgi-bin/bugreport.cgi?bug=719889
Merge pull request #96 from DirectXMan12/master

Enable Process Reaping in All Conditions