First pass at adding transcode support

This does a hard-coded audio encode to vorbis-in-ogg. In the long term,
this should use encodebin and real encoding profiles.

src/org/wikimedia/commons/Transcoder.java

@@ -0,0 +1,10 @@
+package org.wikimedia.commons;
+
+public class Transcoder {
+    public static native int transcode(String infile, String outfile,
+            String profile);
+
+    static {
+        System.loadLibrary("transcode");
+    }
+}