go vet yourself (#397)

go vet caught some nifty bugs. so fixed those here, and also made it so that
we vet everything from now on since the robots seem to do a better job of
vetting than we have managed to.

also adds gofmt check to circle. could move this to the test.sh script (didn't
want a script calling a script, because $reasons) and it's nice and isolated
in its own little land as it is. side note, changed the script so it runs in
100ms instead of 3s, i think find is a lot faster than go list.

attempted some minor cleanup of various scripts

test.sh

@@ -35,7 +35,8 @@ container_ip)
     ;;
 esac
 
-go test -v $(go list ./... | grep -v vendor | grep -v examples | grep -v tool | grep -v cli | grep -v tmp/go/src | grep -v test/fn-api-tests)
+go test -v $(go list ./... | grep -v vendor | grep -v examples | grep -v test/fn-api-tests)
+go vet -v $(go list ./... | grep -v vendor)
 docker rm --force func-postgres-test 
 docker rm --force func-mysql-test