Merge pull request #70 from SandyWalsh/greater_60

>60 errors only if no other error seen

reports/error_details.py

@@ -143,7 +143,7 @@ for uuid_dict in updates:
         _end = _when
         diff = _end - _start
 
-        if diff > 3600:
+        if diff > 3600 and failure_type == None:
             failure_type = ">60"
 
         key = (operation, image_type_num, cell)

reports/pretty.py

@@ -113,7 +113,7 @@ def make_report(yesterday=None, start_hour=0, hours=24, percentile=97,
             end = raw.when
             diff = end - start
 
-            if diff > 3600:
+            if diff > 3600 and failure_type == None:
                 failure_type = '> 60'
 
             key = (operation, image)