added test for lcm (lowest common multiple) as well as corresponding functionality

src/main/py/more_advanced_calculations.py

@@ -3,4 +3,7 @@ def gcd(a,b):
         if a < b:
             (a,b) = (b,a)
         a -= b
-    return a
+    return a
+
+def lcm(a,b):
+    return (a * b) / gcd(a,b)

src/test/py/test_more_advanced_calculations.py

@@ -12,6 +12,9 @@ class more_advanced_calculations(unittest.TestCase):
     def test_gcd_of_747_and_81_should_be_9(self):
         self.assertEqual(gcd(747,81), 9)
 
+    def test_lcm_of_5_and_7_should_be_35(self):
+        self.assertEqual(lcm(5,7), 35)
+
 
 
 if __name__ == '__main__':