test & task for the ping -> pint change

How's this look?

Here's how I tested:
I undid the ping/pint change. I ran "unicorn" and logged in as test1. I created a harvest of 2 pints of achiote and confirmed via the web interface that it displayed as "2 pings" and in psql that the unit was "ping". Then I ran "scripts/deploy.sh" and checked the web interface and psql again to see that it now showed pint in the db and pints in the UI.  (Then I put back the initial ping/pint change so as not to mess up my tree)

I hope running "scripts/deploy.sh" was correct. I also ran "rake" and saw no new failures with the ping/pint change in place and the spec modified.