2.4.0

#2631 new pm2 monit command (blessed dashboard!)
#2670 allow to expose a folder over http via pm2 serve <path> <port>
#2617 fix startup script generation on macosx (launchd)
#2650 new option to append env name to app name (used to allow the same app to be launched in different environement w/o name conflict)
#2671 allow to pass a delay to pm2-docker (pm2-docker process.json --delay 10)
pm2 ecosystem simple to generate a simple ecosystem file
aliasing: pm2-dev <script> <=> pm2-dev start <script>
fix git parsing when using cwd
#2663 allow to directly output json when logging (via log_type for JSON and --log-type via CLI)
#2675 fix path when installing language module like typescript
#2674 increase restart timeout for systemd startup
#2564 allow to operate process (restart/reload/stop/delete) with regex

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