Update test_counting_hash.py

Very small change to fix a copy paste comment error.
Update ChangeLog
Update ChangeLog

Fixed Formatting Issue (Two spaces instead of one)
Merge pull request #661 from jgluck/master

Update test_counting_hash.py (Fixing a ctr+v error)
add code of conduct
clarify notification process
wording tweaks courtesy @ctb & @camillescott
Merge pull request #664 from ged-lab/feature/code-of-conduct

add code of conduct
Merge branch 'master' of https://github.com/ged-lab/khmer into fix/658
Update ChangeLog for fix for Issue 658