Change pid default location from log/ to tmp/pids/

[miguelcma]

Documentation states "All pids and logs will live in the normal log/ folder. This helps to make things Capistrano friendly.". The default location using Capistrano is tmp/pidsand not log/. Shouldn't this default location be changed to tmp/pids?

i.e.:

dir_mode: normal
dir: tmp/pids

[itelmenko]

I think it will be good option. Because when server reloads, tmp folder will be cleaned. Old pid files wiil not block new process instances.
Is the project alive still? It has 8 issues from 2014 year.

[mirasrael]

@izumeroot I'm far away now from Ruby development and hasn't enough free time to support it. If you open pull request I will merge it. Also I'm ready to transfer ownership of this project to somebody who interested in future development of the project.