Extract method for parsing Hive dates
Categorize errors for Hive partition key parsing
Cleanup code in TestDomainTranslator
Add date and timestamp to TupleDomain
Upgrade to airlift tpch 0.4-SNAPSHOT
Check unsafe casts in orc readers
Categorize orc corruption exceptions in Hive connector
Change DATE memory representation to be days

DATE is now stored as a 32-bit number of days since 1970-01-01
Refactor OrcStorageManager
Move mapping of symbol to channel to execution layer

This was incorrectly being done in the planning layer, which
only deals with logical entities.
Remove CodeCache workaround

This is no longer an issue in Java 8
Switch to Docker based Travis builds

This should give us 4GB of memory instead of 3GB and also more CPU
resources
Allow configurable number of tablewriters per worker