Fix type of threading arg in do-paritioning
Add assert for active_threads() to do-partition
Update ChangeLog
Update ChangeLog
Merge pull request #637 from ged-lab/fix/do-partition-threading

Fix type of threading arg in do-paritioning
Merge branch 'master' of github.com:ged-lab/khmer into fix/scriptstderr

Conflicts:
	ChangeLog
	scripts/do-partition.py