Add Podcast Owner Custom Definitions per #171

Some users were saying their podcasts were getting rejected since
`podcast.IOwner` wasn't being set.  This PR adds that functionality
to issue #171.

* Did not disturb existing custom Author string, as users may
already be using that (wasn't sure on the backwards compatibility
with this repo).
* "Name" needed a prefix, since there was already Title and
Description.  Picked `Owner` for now.
* Added to existing Unit Test to ensure it gets set when custom
config is used.

NOTE: I do not have a way to test this as I do not use this repo.
This is just a drive-by PR to help the authors.

pkg/config/config.go

@@ -65,6 +65,8 @@ type Custom struct {
 	Author          string        `toml:"author"`
 	Title           string        `toml:"title"`
 	Description     string        `toml:"description"`
+	OwnerName       string        `toml:"ownerName"`
+	OwnerEmail      string        `toml:"ownerEmail"`
 }
 
 type Server struct {

pkg/config/config_test.go

@@ -41,7 +41,17 @@ timeout = 15
   quality = "low"
   filters = { title = "regex for title here" }
   clean = { keep_last = 10 }
-  custom = { cover_art = "http://img", cover_art_quality = "high", category = "TV", subcategories = ["1", "2"],  explicit = true, lang = "en" }
+  custom = { 
+	  cover_art = "http://img", 
+	  cover_art_quality = "high", 
+	  category = "TV", 
+	  subcategories = ["1", "2"], 
+	  explicit = true, 
+	  lang = "en",
+	  author = "Mrs. Smith ([email protected])",
+	  ownerName = "Mrs. Smith",
+	  ownerEmail = "[email protected]"
+	}
 `
 	path := setup(t, file)
 	defer os.Remove(path)
@@ -77,6 +87,9 @@ timeout = 15
 	assert.EqualValues(t, "TV", feed.Custom.Category)
 	assert.True(t, feed.Custom.Explicit)
 	assert.EqualValues(t, "en", feed.Custom.Language)
+	assert.EqualValues(t, "Mrs. Smith ([email protected])", feed.Custom.Author)
+	assert.EqualValues(t, "Mrs. Smith", feed.Custom.OwnerName)
+	assert.EqualValues(t, "[email protected]", feed.Custom.OwnerEmail)
 
 	assert.EqualValues(t, feed.Custom.Subcategories, []string{"1", "2"})
 

pkg/feed/xml.go

@@ -61,6 +61,13 @@ func Build(ctx context.Context, feed *model.Feed, cfg *config.Feed, provider url
 	p.IAuthor = author
 	p.AddSummary(description)
 
+	if cfg.Custom.OwnerName != "" && cfg.Custom.OwnerEmail != "" {
+		p.IOwner = &itunes.Author{
+			Name:  cfg.Custom.OwnerName,
+			Email: cfg.Custom.OwnerEmail,
+		}
+	}
+
 	if cfg.Custom.CoverArt != "" {
 		p.AddImage(cfg.Custom.CoverArt)
 	} else {