Refactoring: moved high-level connection classes to protocol package.

...t/sf/briar/api/protocol/batch/BatchConnectionFactory.java

...sf/briar/api/protocol/stream/StreamConnectionFactory.java

...t/sf/briar/protocol/batch/BatchConnectionFactoryImpl.java

.../net/sf/briar/protocol/batch/IncomingBatchConnection.java

.../net/sf/briar/protocol/batch/OutgoingBatchConnection.java

...ents/net/sf/briar/protocol/batch/ProtocolBatchModule.java

...et/sf/briar/protocol/stream/IncomingStreamConnection.java

...et/sf/briar/protocol/stream/OutgoingStreamConnection.java

...ts/net/sf/briar/protocol/stream/ProtocolStreamModule.java

...onents/net/sf/briar/protocol/stream/StreamConnection.java

...sf/briar/protocol/stream/StreamConnectionFactoryImpl.java

...ents/net/sf/briar/transport/ConnectionDispatcherImpl.java

test/build.xml

test/net/sf/briar/ProtocolIntegrationTest.java

test/net/sf/briar/db/H2DatabaseTest.java

...sf/briar/protocol/batch/BatchConnectionReadWriteTest.java

test/net/sf/briar/transport/ConnectionWriterTest.java