Add option to set a pid file for unicorn in diaspora.yml

* Add new moderator role. Moderators can view and act on reported posts [#6351](https://github.com/diaspora/diaspora/pull/6351)

* Only post to the primary tumblr blog [#6386](https://github.com/diaspora/diaspora/pull/6386)

* Always show public photos on profile page [#6398](https://github.com/diaspora/diaspora/pull/6398)

* Expose Unicorn's pid option to our configuration system [#6411](https://github.com/diaspora/diaspora/pull/6411)

# 0.5.3.1

    port:

    listen: '0.0.0.0:3000'

    rails_environment: 'development'

    pid:

    stderr_log:

    stdout_log:

    unicorn_worker: 2

    ## Note: this setting is deprecated, use listen instead.

    #port: 3000

    ## Set the path for the PID file of the unicorn master process (default=none)

    #pid: '/run/diaspora/diaspora.pid'

    ## Rails environment (default='development').

    ## The environment in which the server should be started by default.

    ## Change this to 'production' if you wish to run a production environment.

port = port && !port.empty? ? port.to_i : nil

listen port || AppConfig.server.listen.get unless RACKUP[:set_listener]

pid AppConfig.server.pid.get if AppConfig.server.pid?

worker_processes AppConfig.server.unicorn_worker.to_i

timeout AppConfig.server.unicorn_timeout.to_i

stderr_path AppConfig.server.stderr_log.get if AppConfig.server.stderr_log?