Adding Brenden's pending changes.

From 'testing' branch of https://github.com/airbnb/mesos.git.
Adding serialization of Config
Exit after failed configuration serialization (and format fixes).
Don't treat 'local' master differently.
Passed the serialized configuration through TaskInfo.data.

The serialized configuration is in a binary format and previously we
passed this through an environment variable (which required Base64
encoding). Instead, we pass the binary data without Base64 encoding
through the TaskInfo.data field.
Remove 0.12* version reference.
Removed empty Constants.java.
Merge pull request #2 from mesos/rebased-serialize-configuration

Rebased serialize configuration.