Merge branch 'release/0.8.5'
meatlocker
Re-throw the exception in Tool.
Change extraInfo to val.
Merge pull request #487 from twitter/klin_fix_tool

Re-throw the exception in Tool.
Re-throw all exceptions in Tool.
Merge pull request #490 from twitter/klin_fix_tool_run

Re-throw all exceptions in Tool.
Change version number to 0.8.6.
Bumping version numbers.
Bumping version numbers.
Adds serializers for Field
Fix an bug introduced in the previous commit
Merge pull request #485 from twitter/add_meatlocker

Meatlocker all ops in Operations.scala
Merge branch 'develop' of github.com:twitter/scalding into feature/optimizedmatrix