add lager logstash backend to production

[facundoolano]

Added lager configuration and dependencies assuming a logstash instance running locally in the prod server.

Example logstash.conf to send the erlang input to stdout:

input {
  udp {
    codec => "json"
    port => 9125
    type => "erlang"
  }
}

output {
  stdout { codec => json }
}

Fixes #196

[unbalancedparentheses]

@facundoolano is this done or is it a WIP?

[facundoolano]

it's done but it doesn't include any logstash configuration El nov 18, 2017 6:26 PM, "Federico Carrone" <notifications@github.com> escribió:

…

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