Make the management tool opt-in by default

[aej]

I think it would be more convenient for the management tool to be removed by default from the application children and instead make it opt-in.

This would let library users who do not want to run the management tool at all, or who want to run the management tool in a different place (i.e inside another Plug-based application/supervision tree) be able to do so without unnecessarily running a webserver.

We can then instruct library users to simply add the Crawly.API.Router to their supervision tree with whatever configuration/plug-compatible webserver they choose.

# application.ex
defmodule MyApp.Application do
  use Application

  def start(_) do
    children = [
      ...
      {Plug.Cowboy, scheme: :http, plug: Crawly.API.Router}
      ...
    ]
  end
end

[oltarasenko]

I like the idea!

[oltarasenko]

Hey @aej I have tried to address this idea in the: https://github.com/elixir-crawly/crawly/pull/265

[aej]

Hey @aej I have tried to address this idea in the: #265

Fantastic - it looks good to me.

[samullen]

Any chance of getting this released soon? Pretty please?

[oltarasenko]

Yes sure. There is no reason to keep it unreleased. let me prepare the release early this week