Clean up comments
Overhaul to handle SIGTERM properly, with orderly shutdown of aux processes.

* Top-level SIGTERM trap is after starting processes, to avoid app from
  inheriting it, so the app can receive SIGTERM for orderly dyno shutdown.

* SIGTERM is ignored by the subshells and by the auxiliary processes.

* FIFO is removed after the first exit_process, so that following writes
  won't be blocked (they'll write to an actual tmp file).

* Translate subshell SIGHUP to preferred per-process shutdown signal
  (SIGINT) rather than sending SIGINT to the subshell, since it tends to be
  squashed by the shell.
Respect PGBOUNCER_ENABLED (default true if unset)
Expand pid names properly
Merge pull request #20 from agriffis/fix-app-sigterm

Overhaul to handle SIGTERM properly.
Use docker to compile binaries for heroku
Use stunnel v5.01
Remove empty stunnel build script
stunnel make install is now without prompts
v0.3.0 changelog
Correct bin paths to match new tar format