Remove pig dependencies from pigpen-core
Remove column pruning (wasn't used)
Move register$ and option$ into new pigpen.pig.oven
Change io operations to dispatch on keywords instead of pig-specific loader classes
Merge pull request #82 from Netflix/update-deps

Remove pig dependencies from pigpen-core
Merge pull request #83 from Netflix/pig-oven

Pig oven
Merge pull request #84 from Netflix/dispatch-io

Dispatch io on keywords
Update the bootstrap namespace to pigpen.runtime
Merge pull request #85 from Netflix/fix-bootstrap-ns

Fix bootstrap ns
Merge branch 'sans-pig' into cascading

* sans-pig:
  Update the bootstrap namespace to pigpen.runtime
  Change io operations to dispatch on keywords instead of pig-specific loader classes
  Move register$ and option$ into new pigpen.pig.oven
  Remove column pruning (wasn't used)
  Remove pig dependencies from pigpen-core