Ignore .btfu.

Signed-off-by: Casey Dwyer <caseydwyer@gmail.com>
Add tests.

Signed-off-by: Casey Dwyer <caseydwyer@gmail.com>
Add .csvignore.

Signed-off-by: Casey Dwyer <caseydwyer@gmail.com>
Add btfu.

Signed-off-by: Casey Dwyer <caseydwyer@gmail.com>