Update database usage in integration tests
Copy database setup (resetdb.sh and storage.sql) from trillian repo. Update script to create a user and database named "sigsum_test" rather than the generic "test", and update test.sh to pass a corresponding --mysql_uri when starting trillian processes.
Add a README.md file documenting setup of database and dependencies for running the integration test.
Closes #25 (closed).
Edited by Niels Möller