Merge pull request #27 from lesderid/opus

Add support for the Opus codec

AUTHORS

@@ -22,6 +22,7 @@ Contributors:
   Jeroen Asselman
   John Millikin
   Julien Moutte
+  Les De Ridder
   Marek Habersack
   Mike Gemünde
   Patrick Dehne

src/TagLib/Ogg/Codec.cs

@@ -136,6 +136,10 @@ public static Codec GetCodec (ByteVector packet)
 			if (c != null)
 				return c;
 			
+			c = Codecs.Opus.FromPacket (packet);
+			if (c != null)
+				return c;
+
 			throw new UnsupportedFormatException ("Unknown codec.");
 		}