Move static methods to a separate class

This seems to confuse TestNG, which tries to invoke some of the public
static methods during setup
Add dummy field to TestingSplit

This is to avoid exceptions due to Jackson refusing to serialize/deserialize
an object with no fields
Move ORC reader to new presto-orc module
Move all presto-hive ORC code into separate package
Fix ORC MapJsonReader timezone
Consolidate Hive session code in HiveSessionProperties
Update ORC and DWRF to respect optimized_reader_enabled session property
Update to floatingdecimal 0.2

This version prints a better error message when attempting to use it with Java 8