Source NFO downloads (#95)

* Hooked up series directory finding to source metadata runner

* Fixed aired NFO tag for episodes

* Updated MI NFO builder to take in a filepath

* Hooked up NFO generation to the source worker

* Added NFO controls to form

* Improved the way the source metadata worker updates the source

* Consolidated NFO selection options in media profile instead of source

test/support/fixtures/sources_fixtures.ex

@@ -85,4 +85,18 @@ defmodule Pinchflat.SourcesFixtures do
     source_attributes
     |> Enum.map_join("\n", &Phoenix.json_library().encode!(&1))
   end
+
+  def source_details_return_fixture(attrs \\ %{}) do
+    channel_id = Faker.String.base64(12)
+
+    %{
+      channel_id: channel_id,
+      channel: "Channel Name",
+      playlist_id: channel_id,
+      playlist_title: "Channel Name",
+      filename: Path.join([Application.get_env(:pinchflat, :media_directory), "foo", "bar.mp4"])
+    }
+    |> Map.merge(attrs)
+    |> Phoenix.json_library().encode!()
+  end
 end