Moved some common functions to 'utils'

problem92.py

 #!/usr/bin/env python
-def digits(n):
-    return [n] if n < 10 else digits(n / 10) + [n % 10]
+from utils import digits
 
 def quad(n):
     return n * n

utils.py

+def digits(n):
+    return [n] if n < 10 else digits(n / 10) + [n % 10]
+
 def _gcd(a, b):
     while b:
         a, b = b, a % b