Fix java.nio.*Buffer issues

[tiainen]

Fixes #13. The PR adds code that will convert invocations on java.nio.*Buffer methods to be called on java.nio.Buffer instead for the following methods: clear(), flip(), limit(int), mark(), position(int), reset() and rewind().

It basically changes an invokevirtual bytecode invocation from:

115: invokevirtual #18 // Method java/nio/ByteBuffer.clear:()Ljava/nio/ByteBuffer;

to

115: invokevirtual #71 // Method java/nio/Buffer.clear:()Ljava/nio/Buffer;