Remove dependency on SQL in tree verifier
Remove dependency on SQL in tree verifier

cesarghali/keytransparency,alsophian/keytransparency,google/keytransparency,alsophian/keytransparency,gdbelvin/keytransparency,AMarcedone/keytransparency,AMarcedone/keytransparency,gdbelvin/keytransparency,google/keytransparency,cesarghali/keytransparency