Added Int, Short, Float, Double, and Long Serializer Tests
(Re)add TransitiveClosureNaive, fix join, add ITCase

Scala Join took left key selector for both sides of join. Re-enable
union. TransitiveClosureNaive uses union, this is tested in the ITCase.

Properly disable GlobalSchemaGenerator, the information it created has
not been used, only local field positions have been used.
Add tupleType() method to CsvReader that allows to read directly into subclasses of Tuple
Fix CSV reader tests and added comments to CSV reader.
Display Exceptions in the JobManager webinterface