Builders for batches and bundles.

api/net/sf/briar/api/db/DatabaseComponent.java

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

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

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

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

components/net/sf/briar/db/DatabaseComponentImpl.java

...nents/net/sf/briar/db/ReadWriteLockDatabaseComponent.java

...onents/net/sf/briar/db/SynchronizedDatabaseComponent.java

test/build.xml

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

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

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

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