Merge PR #354: Add LZMA and PPMd to the CompressionMethod enum

Author: Numpsy

src/ICSharpCode.SharpZipLib/Zip/ZipConstants.cs

@@ -52,6 +52,16 @@ public enum CompressionMethod
 		/// </summary>
 		BZip2 = 12,
 
+		/// <summary>
+		/// LZMA compression. Not supported by #Zip.
+		/// </summary>
+		LZMA = 14,
+
+		/// <summary>
+		/// PPMd compression. Not supported by #Zip.
+		/// </summary>
+		PPMd = 98,
+
 		/// <summary>
 		/// WinZip special for AES encryption, Now supported by #Zip.
 		/// </summary>