Merge pull request #11 from brndnmtthws/master

Added metrics, fixed zombie trackers.
Adding port fixes
Updated Mesos version
Increased JVM overhead slightly (2.5%).
Added missing snappy dependency.
Updated README.
Merge pull request #13 from brndnmtthws/increase-overhead

Fixes
Handle edge case for tracker cleanup timer.
Randomize port selection.
Merge pull request #12 from rcarmo/master

Bumped Mesos version and merged port fix
Merge pull request #14 from brndnmtthws/master

Fixed port overlap, tracker GC