Add some macros

These were written by Will Vaughan.  Just checking them in.

I added several unit tests.  However these can't be run with pig 0.10 due to a bug in importing macros with PigUnit.  This will be fixed by pig 0.11.  For now they are disabled.  However they do pass with a patched pig 0.10.
Remove countByParallel.pig
Merge branch 'master' of github.com:matthayes/datafu
Merge branch 'master' of github.com:linkedin/datafu
Turn off JvmMetrics log garbage
Remove appenders for root logger to reduce log spam
Remove macros code
Removes macros
Merge pull request #28 from matthayes/master

Logging cleanup