Load additional icons from HTML

When a Web App Manifest is found and loaded, we still want to check HTML
for some additional icons that are usually not added to manifests.

lib/manifique/web_client.rb

@@ -18,6 +18,8 @@ module Manifique
 
       if manifest = fetch_web_manifest
         @metadata.load_from_web_manifest(manifest)
+        parse_apple_touch_icons_from_html
+        parse_mask_icon_from_html
       else
         parse_metadata_from_html
       end

spec/manifique/web_client_spec.rb

@@ -147,6 +147,20 @@ RSpec.describe Manifique::WebClient do
       it "knows which properties were loaded from the web app manifest" do
         expect(subject.from_web_manifest.length).to eq(10)
       end
+
+      it "loads iOS icons from HTML" do
+        apple_touch_icons = subject.icons.select{|i| i["purpose"] == "apple-touch-icon"}
+        expect(apple_touch_icons.length).to eq(1)
+        expect(apple_touch_icons.first["type"]).to eq("image/png")
+        expect(apple_touch_icons.first["sizes"]).to eq("180x180")
+      end
+
+      it "loads SVG mask icons from HTML" do
+        mask_icon = subject.icons.find{|i| i["purpose"] == "mask-icon"}
+        expect(mask_icon["color"]).to eq("#2b90d9")
+        expect(mask_icon["type"]).to eq("image/svg")
+        expect(mask_icon["sizes"]).to be_nil
+      end
     end
 
     context "no web app manifest present" do