Nested user-defined objects (and collections of them) can now be read

api/net/sf/briar/api/protocol/BundleWriter.java

api/net/sf/briar/api/protocol/Tags.java

api/net/sf/briar/api/serial/ObjectReader.java

api/net/sf/briar/api/serial/Reader.java

api/net/sf/briar/api/serial/Writer.java

components/net/sf/briar/protocol/BatchIdReader.java

components/net/sf/briar/protocol/BundleReaderImpl.java

components/net/sf/briar/protocol/BundleWriterImpl.java

components/net/sf/briar/protocol/GroupIdReader.java

components/net/sf/briar/protocol/HeaderFactory.java

components/net/sf/briar/protocol/HeaderFactoryImpl.java

components/net/sf/briar/protocol/MessageEncoderImpl.java

components/net/sf/briar/protocol/MessageReader.java

components/net/sf/briar/protocol/MessageReaderImpl.java

components/net/sf/briar/protocol/ProtocolModule.java

components/net/sf/briar/serial/ReaderImpl.java

components/net/sf/briar/serial/WriterImpl.java

test/build.xml

test/net/sf/briar/protocol/BundleReadWriteTest.java

...t/sf/briar/protocol/SigningDigestingOutputStreamTest.java