Adds Apache License Headers, enables rat-check, find-bugs and checkstyle plugins. Contributed by Venkatesh Seetharam

service is now loaded correctly.

Fix Hive Importer to work with Graph repository and needed refactoring.   Also fix enum handling in the repository

with integration tests (specifically the metadata.keystore file &
keystore plugin), but int tests are otherwise loading Guice
dependency-injected instances correctly.