Upgrade to the latest versions of uniform and dependencies.

This provides scalding 0.12rc5 and execution monad support.
Changes from Edge HDFS to permafrost HDFS.
Fixes hidden import warnings.
Changes Errors to use the typed pipe addTrap instead of rich pipe's.

This means that flowDef and mode are no longer needed as parameters.
Removes flowDef and mode as implicit parameters for load.
Factors out setup code from LoadSpec into a separate trait LoadTestUtil.
Adds optional path for the hive tables to CustomerCascade.