adds local:characterize command to mortar core
  -- macro wrapped in controlscript wrapped in pigscript
  -- controlscript reads from a provided param file
  -- depends on some jars which are pulled from s3
  -- will be a plugin later
adds some comments and passes tests
removes some junk files, adds comments to command/local.rb
adds example paramfile to comments in mortar core, adds pig param to toggle type inference, tests pass
  -- fixes bug where type is set to NULL if null is most common value
in case a field is always null
python style points
Merge pull request #122 from mortardata/oleiman_characterize_command

[#53316549] adds local:characterize command to mortar core