Make each head pipe have a unique name
Merge pull request #1025 from twitter/unique_head_names

Make each head pipe have a unique name
Merge https://github.com/twitter/scalding into develop
Add an ExecutionApp trait for objects to skip the Job class
Remind me I'm a fool next time I'm cranky
Merge pull request #1027 from twitter/executionapp

Add an ExecutionApp trait for objects to skip the Job class
Merge https://github.com/twitter/scalding into develop