Merge pull request #484 from twitter/revertTFrozenKeys

Revert "Merge pull request #477 from twitter/feature/ianoc_frozen_keys"
Mark the scalding platform as serializable, but also don't grab the platform in the scalding env
Merge pull request #485 from twitter/dontGrabScaldingPlatformInScaldingEnv

Mark the scalding platform as serializable, but also don't grab the plat...
Merge branch 'develop' into alexlevenson/UniqueKeyedServiceFullySatisfiable