twitter/scalding — pull request #257 by koertkuipers (2012-12-20 21:12:19+00:00)
Title: Change type paramatrization of RichPipe.using and provide context for GroupBuilder

The change to RichPipe.using as discussed on mailing list.

Added support for using context to GroupBuilder because i needed state it in a complex mapStream (cascading Buffer) based computation