passes checks in python3

rowers/metrics.py

@@ -1,6 +1,7 @@
-from utils import lbstoN
+from __future__ import absolute_import
+from rowers.utils import lbstoN
 import numpy as np
-from models import C2WorldClassAgePerformance
+from rowers.models import C2WorldClassAgePerformance
 import pandas as pd
 from scipy import optimize
 from django.utils import timezone