Feature/mesos 0.17

- Enabled Mesos 0.17.0 support.
- Bumped ```mesos-utils``` version to ```0.0.7```. Please review and merge https://github.com/mesosphere/mesos-utils/pull/2 before merging this in.
- Removed Scala 2.10.0 dependency brought in by ```org.scalatest``` with exclusion rule.