Adds head and sortedTake to KeyedList
Pull out scalding-json as a separate module.
Add scalding-json to project/Build.
Added Test for CascadingJob Through Tool.main
Fix CascadeJob NPE
- Overrode validate to iterate over def jobs to call validate on each
  job.
Clean build dependencies.
Remove jackson dependency from scalding-core.
Generate simple json JobStats in Tool.
adds quotes around json value.
Only add quotes fro strings.
Merge pull request #705 from twitter/klin_scalding_json

Pull out scalding-json as a separate module.
Merge pull request #678 from pcting/fix/cascade-job-flowdef-npe

Fix CascadeJob FlowDef NPE
Add tests for head/sortWithTake
Fix KeyedList variance and joining
update comment
Revert the KeyedListLike, just use KeyedList
Merge pull request #711 from twitter/keyedlistlike

Fix KeyedList variance and joining
Adds README to scalding-repl module
Merge pull request #714 from jhlch/add-repl-readme

Adds README to scalding-repl module
Merge pull request #702 from twitter/typed-methods

Adds head and sortedTake to KeyedList