Ensure non-WIP reviews have a score of 1 as a base

All non-WIP reviews should have a score of 1, this will ensure
that they are prioritized above WIP reviews. All reviews will
see an increase in score by 1 (WIP has a score of 0 now, all other
reviews start with a score of 1, and are modified up as appropriate).

Change-Id: I086cb01c7b8a71a9a1ec3cee2bd826f3d397c52e

reviewday/mergeprop.py

@@ -87,6 +87,8 @@ class MergeProp(object):
             # adjust the subject to indicate it's a WIP
             score = 0
             self.subject = '(WIP): %s' % self.subject
+        else:
+            score += 1
         self.score = score
         self.reason = reason
         self.cause = cause