Update various dependency versions

- Upgrade findbugs to 2.0.3 (from 2.0.2)
- Upgrade slf4j to 1.7.6 (from 1.7.5)
- Upgrade logback to 1.1.1 (from 1.0.13)
- Upgrade testng to 6.8.8 (from 6.8.7)
Add airlift @ version 0.86