nbt: Get tests passing again, and silence warnings in the doc tests.
nbt: Get tests passing again, and silence warnings in the doc tests.

Signed-off-by: Aaron Jacobs <94eb18a3f3d75b115c91915c9ebacc4dd15c8941@gmail.com>

toqueteos/hematite_server,fenhl/hematite_server,PistonDevelopers/hematite_server