Add definition 5.5.6 - #160

Signed-off-by: Rogerio Prado de Jesus <rogeriopradoj@gmail.com>
Chmod +x definition 5.5.6 - #160

Signed-off-by: Rogerio Prado de Jesus <rogeriopradoj@gmail.com>
Update STABLE_DEFINITIONS with 5.5.6 - #160

Signed-off-by: Rogerio Prado de Jesus <rogeriopradoj@gmail.com>
Update travis.yml to run 5.5.6 - #160

Fix #160: Need definition for 5.5.6

Signed-off-by: Rogerio Prado de Jesus <rogeriopradoj@gmail.com>