Merge pull request #13 from Applicat/add_asin_attribute_to_release2

Adds release fields asin, barcode and quality.

README.md

@@ -109,7 +109,10 @@ MusicBrainz::Release.find(id)
   :status  => String,
   :format  => String,
   :date    => Date,
-  :country => String
+  :country => String,
+  :asin    => String,
+  :barcode => String,
+  :quality => String
 }
 ```
 

lib/musicbrainz/bindings/release.rb

@@ -9,7 +9,10 @@ module MusicBrainz
           title: (xml.xpath('./title').text rescue nil),
           status: (xml.xpath('./status').text rescue nil),
           country: (xml.xpath('./country').text rescue nil),
-          date: (xml.xpath('./date').text rescue nil)
+          date: (xml.xpath('./date').text rescue nil),
+          asin: (xml.xpath('./asin').text rescue nil),
+          barcode: (xml.xpath('./barcode').text rescue nil),
+          quality: (xml.xpath('./quality').text rescue nil)
         }
         
         formats = (xml.xpath('./medium-list/medium/format') rescue []).map(&:text)

lib/musicbrainz/models/release.rb

@@ -6,7 +6,10 @@ module MusicBrainz
     field :format, String
     field :date, Date
     field :country, String
-
+    field :asin, String
+    field :barcode, String
+    field :quality, String
+    
     def tracks
       @tracks ||= client.load(:release, { id: id, inc: [:recordings, :media], limit: 100 }, {
         binding: :release_tracks,

spec/models/release_spec.rb

@@ -15,12 +15,15 @@ describe MusicBrainz::Release do
   end
 
   it "gets correct release data" do
-    release = MusicBrainz::Release.find("2225dd4c-ae9a-403b-8ea0-9e05014c778f")
-    release.id.should == "2225dd4c-ae9a-403b-8ea0-9e05014c778f"
-    release.title.should == "Empire"
+    release = MusicBrainz::Release.find("b94cb547-cf7a-4357-894c-53c3bf33b093")
+    release.id.should == "b94cb547-cf7a-4357-894c-53c3bf33b093"
+    release.title.should == "Humanoid"
     release.status.should == "Official"
-    release.date.should == Date.new(2006, 8, 28)
-    release.country.should == "GB"
+    release.date.should == Date.new(2009, 10, 6)
+    release.country.should == "US"
+    release.asin.should == 'B002NOYX6I'
+    release.barcode.should == '602527197692'
+    release.quality.should == 'normal'
   end
 
   it "gets correct release tracks" do