adds properties needed by hraven
fix stream
add java md5 jex
Merge pull request #473 from twitter/feature/add_properties

Adds JobConf Properties needed by hRaven
Merge branch 'develop' of github.com:twitter/scalding into feature/optimizedmatrix
Non-polymorphic and naive sum (as in the mockup) for Scalding
added license headers
removed .ds_store
Merge pull request #476 from hmdavis/develop

added license headers
Merge branch 'develop' of github.com:twitter/scalding into feature/optimizedmatrix
Very basic naive and non-generic matrix product in Scalding