Refactor + add support for combiners; to be tested
Fix typo
A first compiling version (untested) of local run emulator
An operational local run emulator for Controller

... to be tested on Hadoop to make sure we didn't break anything for
the real production mode.
Local mode automatically works on folders and files
Local runner plays nice with binary dir taps
Local/hdfsFileExists: Check for both files and folders
Convenience additions: readTap and withRandomLocalFile
Add more granular distinctions to runnion IO actions
Local mode: Try to sort more intelligently
Worker nodes not short-circuit after they're done processing
Redesign MRKey as types that can be used as MR keys
Actually implement worker node short-circuiting
Better error messages, better sorting
Local: Fix sorting
Add SafeCopy protocol
Add runOnce combinator in Controller
Add some release notes