Adds type field to release model.

lib/musicbrainz/bindings/release.rb

@@ -6,6 +6,7 @@ module MusicBrainz
         
         hash = {
           id: (xml.attribute('id').value rescue nil),
+          type: (xml.xpath('./release-group').attribute('type').value rescue nil),
           title: (xml.xpath('./title').text rescue nil),
           status: (xml.xpath('./status').text rescue nil),
           country: (xml.xpath('./country').text rescue nil),

lib/musicbrainz/models/release.rb

@@ -1,6 +1,7 @@
 module MusicBrainz
   class Release < BaseModel
     field :id, String
+    field :type, String
     field :title, String
     field :status, String
     field :format, String
@@ -20,7 +21,7 @@ module MusicBrainz
 
     class << self
       def find(id)
-        client.load(:release, { id: id, inc: [:media] }, {
+        client.load(:release, { id: id, inc: [:media, :release_groups] }, {
           binding: :release,
           create_model: :release
         })

lib/musicbrainz/models/release_group.rb

@@ -9,7 +9,7 @@ module MusicBrainz
     alias_method :disambiguation, :desc
 
     def releases
-      @releases ||= client.load(:release, { release_group: id, inc: [:media], limit: 100 }, {
+      @releases ||= client.load(:release, { release_group: id, inc: [:media, :release_groups], limit: 100 }, {
         binding: :release_group_releases,
         create_models: :release,
         sort: :date