Addressed issues from code review.

briar-api/src/org/briarproject/api/contact/Contact.java

...-api/src/org/briarproject/api/contact/ContactManager.java

briar-api/src/org/briarproject/api/db/DatabaseComponent.java

briar-api/src/org/briarproject/api/db/StorageStatus.java

...pi/src/org/briarproject/api/identity/IdentityManager.java

briar-api/src/org/briarproject/api/identity/LocalAuthor.java

...core/src/org/briarproject/contact/ContactManagerImpl.java

briar-core/src/org/briarproject/contact/ContactModule.java

briar-core/src/org/briarproject/db/Database.java

...r-core/src/org/briarproject/db/DatabaseComponentImpl.java

briar-core/src/org/briarproject/db/JdbcDatabase.java

...re/src/org/briarproject/identity/IdentityManagerImpl.java

.../src/org/briarproject/messaging/MessagingManagerImpl.java

...-core/src/org/briarproject/messaging/MessagingModule.java

briar-core/src/org/briarproject/sync/AuthorFactoryImpl.java

...ts/src/org/briarproject/db/DatabaseComponentImplTest.java

briar-tests/src/org/briarproject/db/H2DatabaseTest.java

...rg/briarproject/sync/SimplexMessagingIntegrationTest.java