Add Counters.getCountersForGroup, and also sort counters in those helpers.
don't query for null group
use running job directly when possible to speed up counter retrieval
Filter for incrementing a counter by the value of a field
allow specification of field to sum
Merge pull request #8 from pwestling/master

Add Filter to increment counter by value of field
Add the Turnstile Operator
Rename Turnstile to Count
Rename Count to Increment
Clean up Increment and IncrementCounter
Make Increment a SubAssembly
Add SumCounter
Fix SumCounter class name
Add convenience constructors to SumCounter
add script to kill task attempts on cluster by name
move to scripts folder
jobtracker and port
one last time
Move Increment to assembly package
Add TestIncrement