MagicDBUpdater

Converted all tests to no longer require external dependencies, where possible.
Annotated all existing unit tests with UnitTest category.
Annotated remaining integration tests with IntegrationTest category.
PROTIP: Integration test is defined as any test that requires an external resource to run. That is, web site/service, database, etc.
Fixed bug where cloning a Downloader with a null Observer caused a NullPointerException.
Created setter methods in inner Thread class for unit testing.
Added Cloneable interface to Observer class.
Replaced direct use of Java Reflection with PowerMock Whitebox where applicable.