Adds head and sortedTake to KeyedList
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
Merge