Updated version of Chaos to depend on (0.5.0 -> 0.5.1).  Added a transitive dependency exclusion for an older version of Jackson.
Added a stubbed Jackson Protos.MarathonTask deserializer implementation.
Added a document describing the existing HTTP interface to Marathon.
Temporarily reverted to latest publicly available version of Chaos.
Added `stagedAt` and `startedAt` fields to the MarathonTask serializer, formatted as ISO.
Added a Markdown template and an associated processing script to automatically generate accurate HTTP API documentation.  Ran same to re-generate REST.md.
Merge pull request #120 from mesosphere/wip-rest-docs

REST docs